just download iOS 16.4 and create new simulator iPhone 8 plus and it will select iOS 16.4 automatically, thats all.
Salemaljebaly
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in xCode, go to Product > Destination > Manage run Destination
Click on Plus button and select OS version > Download more Simulator Runtimes
Add new iOS and and start download iOS 16.4
last thing just add new iPhone 8 plus and it will select iOS 16.4 automatically