I am facing the same issue with the life version of watchOS 9.1.
Says the console:
DVTDownloadable: Download Failed. Downloadable: https://download.developer.apple.com/Developer_Tools/watchOS_20S75/Watch6_7_20S75.dmg. Error Domain=DVTACSURLSessionDelegate Code=1 "Failed with HTTP status 403: forbidden" UserInfo={NSLocalizedDescription=Failed with HTTP status 403: forbidden}
DVTDownloadable: Download Failed. Downloadable: https://devimages-cdn.apple.com/downloads/xcode/dsc/Watch6_7_20S75.dmg. Error Domain=DVTACSURLSessionDelegate Code=1 "Failed with HTTP status 403: forbidden" UserInfo={NSLocalizedDescription=Failed with HTTP status 403: forbidden}