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For what it’s worth, I get around this with a rendition that doesn’t take a delegate parameter, cutting the Gordian knot: extension URLSession { public nonisolated func download(with url: URL) async throws -> (URL, URLResponse) { try await download(from: url) } }

Then you can just do the appropriate os_signpost calls. Personally, I use a helper swift class to make sure that the category is correct and the format of the strings is correct. E.g. import Foundation import os.log // MARK: - CustomPointsOfInterestLog /// Custom Points of Interest Log /// /// This allows logging of events and intervals to a custom “Points of Interest” tool in Instruments. /// /// Needless to say, this assumes that you have installed the custom Points of Interest tool in Instrumewnts. class CustomPointsOfInterestLog { fileprivate let log: OSLog init(subsystem: String) { log = OSLog(subsystem: subsystem, category: "Interval") } func event(name: StaticString = "Points", label: String, concept: EventConcept = .debug) { os_signpost(.event, log: log, name: name, InstrumentsInterval.formatString, label, concept.rawValue) } func interval<T>(name: StaticString = "Intervals", label: String, concept: EventConcept = .debug, block: () throws -> T) rethrows -> T { let interval = InstrumentsInterval(name: name, label: label, concept: concept, log: self) interval.begin() defer { interval.end() } return try block() } } // MARK: - EventConcept extension CustomPointsOfInterestLog { /// EventConcept enumeration /// /// This is used to dictate the color of the intervals in our custom instrument. /// See [Event Concept Engineering Type](https://help.apple.com/instruments/developer/mac/current/#/dev66257045). enum EventConcept: String { case success = "Success" case failure = "Failure" case fault = "Fault" case critical = "Critical" case error = "Error" case debug = "Debug" case pedantic = "Pedantic" case info = "Info" case signpost = "Signpost" case veryLow = "Very Low" case low = "Low" case moderate = "Moderate" case high = "High" case red = "Red" case orange = "Orange" case blue = "Blue" case purple = "Purple" case green = "Green" } } // MARK: - InstrumentsInterval /// Interval to be shown in custom instrument when profiling app struct InstrumentsInterval { fileprivate static let formatString: StaticString = "Label:%{public}@,Concept:%{public}@" let name: StaticString let label: String let concept: CustomPointsOfInterestLog.EventConcept let log: CustomPointsOfInterestLog let id: OSSignpostID init(name: StaticString, label: String, concept: CustomPointsOfInterestLog.EventConcept = .debug, log: CustomPointsOfInterestLog) { self.name = name self.concept = concept self.label = label self.log = log self.id = OSSignpostID(log: log.log) } /// Manually begin an interval func begin() { os_signpost(.begin, log: log.log, name: name, signpostID: id, Self.formatString, label, concept.rawValue) } /// Manually end an interval func end() { os_signpost(.end, log: log.log, name: name, signpostID: id) } /// Manually emit an event func event() { os_signpost(.event, log: log.log, name: name, signpostID: id, Self.formatString, label, concept.rawValue) } } And then I can do logging like so: private let log = CustomPointsOfInterestLog(subsystem: "Example") class Example { func synchronousTask() { log.interval(name: "Example", label: #function, concept: .green) { Thread.sleep(forTimeInterval: 2) } } } And I can see my colored output:

I color my points of interest using a custom instrument <?xml version="1.0" encoding="UTF-8" ?> <!-- Instruments Developer Help: https://help.apple.com/instruments/developer/mac/current/ --> <package> <id>com.robertmryan.CustomInterval</id> <version>0.2</version> <title>Custom Points of Interest</title> <owner> <name>Robert Ryan</name> </owner> <import-schema>os-signpost</import-schema> <!-- See https://help.apple.com/instruments/developer/mac/current/#/dev536412616 --> <os-signpost-point-schema> <id>custom-point-schema</id> <title>Points</title> <owner> <name>Robert Ryan</name> </owner> <purpose>Provide mechanism for multicolored events posted by `os_signpost`; The string generated by `os_signpost` must be in form of "Label:%d,Concept:%{public}@", where "Label" is string that will control what text appears in the event, and "Concept" is one of the strings listed in https://help.apple.com/instruments/developer/mac/current/#/dev66257045 that dictates the color of the interval. No spaces after the commas within this string.</purpose> <note>That message must use that printf-style format, not embedding the values in the format string literal.</note> <!-- you can constrain this to a particular subsystem if you'd like: <subsystem>"com.domain.MyApp"</subsystem> --> <category>"Interval"</category> <name>?name</name> <pattern> <message>"Label:" ?label ",Concept:" ?concept</message> </pattern> <column> <mnemonic>name</mnemonic> <title>Name</title> <type>string</type> <expression>?name</expression> </column> <column> <mnemonic>label</mnemonic> <title>Label</title> <type>string</type> <expression>?label</expression> </column> <column> <mnemonic>concept</mnemonic> <title>Concept</title> <type>event-concept</type> <expression>?concept</expression> </column> </os-signpost-point-schema> <os-signpost-interval-schema> <id>custom-interval-schema</id> <title>Intervals</title> <owner> <name>Robert Ryan</name> </owner> <purpose>Provide mechanism for multicolored intervals posted by `os_signpost`; The string generated by `os_signpost` must be in form of "Label:%d,Concept:%{public}@", where "Label" is string that will control what text appears in the interval, and "Concept" is one of the strings listed in https://help.apple.com/instruments/developer/mac/current/#/dev66257045 that dictates the color of the interval. No spaces after the commas within this string.</purpose> <note>That message must use that printf-style format, not embedding the values in the format string literal.</note> <!-- you can constrain this to a particular subsystem if you'd like: <subsystem>"com.domain.MyApp"</subsystem> --> <category>"Interval"</category> <name>?name</name> <start-pattern> <message>"Label:" ?label ",Concept:" ?concept</message> </start-pattern> <column> <mnemonic>name</mnemonic> <title>Name</title> <type>string</type> <expression>?name</expression> </column> <column> <mnemonic>label</mnemonic> <title>Label</title> <type>string</type> <expression>?label</expression> </column> <column> <mnemonic>concept</mnemonic> <title>Concept</title> <type>event-concept</type> <expression>?concept</expression> </column> </os-signpost-interval-schema> <instrument> <id>com.robertmryan.CustomInterval.instrument</id> <title>Custom Points of Interest</title> <category>Behavior</category> <purpose>Provide multi-colored intervals as dictated by the "event-concept" parsed from the `start-pattern` string.</purpose> <icon>Points of Interest</icon> <limitations></limitations> <create-table> <id>custom-interval-table</id> <schema-ref>custom-interval-schema</schema-ref> </create-table> <create-table> <id>custom-point-table</id> <schema-ref>custom-point-schema</schema-ref> </create-table> <graph> <title>Custom Interval Graph</title> <lane> <title>Points</title> <table-ref>custom-point-table</table-ref> <plot-template> <instance-by>name</instance-by> <label-format>%s</label-format> <value-from>name</value-from> <color-from>concept</color-from> <label-from>label</label-from> </plot-template> </lane> <lane> <title>Intervals</title> <table-ref>custom-interval-table</table-ref> <plot-template> <instance-by>name</instance-by> <label-format>%s</label-format> <value-from>name</value-from> <color-from>concept</color-from> <label-from>label</label-from> <qualified-by>layout-qualifier</qualified-by> </plot-template> </lane> </graph> <list> <title>Custom Regions of Interest</title> <table-ref>custom-interval-table</table-ref> <column>name</column> <column>label</column> <column>concept</column> <column>start</column> <column>duration</column> </list> <list> <title>Custom Points of Interest</title> <table-ref>custom-point-table</table-ref> <column>name</column> <column>label</column> <column>concept</column> </list> </instrument> </package>

As carlos_reyes - https://developer.apple.com/forums/profile/carlos_reyes said: I had the same issue. I restarted the MacBook in safe mode (press and hold the Shift key while it boots) and I was able to perform the update. I hope this will work for you.  Worked for me.

Yes, for me too. Re-downloaded this morning, restarted computer, and then perform the "software update" in "system preferences" and it worked. It took a while, and there were moments that it looked like it froze, but after 45 minutes or so, it successfully installed.This same process (which I repeated several times) didn't work yesterday, but it worked this morning, so it would appear that Apple has fixed the installer during the interim.

I'm getting same message.MacBook Pro (15-inch, 2018)

I haven't found method documentation. And the quick help is not very useful:(That looks like it was generated from the source.)But see Using Key-Value Observing in Swift.