My face time isn't working on my desktop. I keep getting an error message saying this beta version of facetime has expired.

my facetime on my desktop keeps giving me an error message.   This beta version of facetime has expired.

Can you clarify what Mac and Mac OS you really have? Facetime was introduced in 2010, four years after PowerMacs were discontinued. And "iOS" is not an computer OS.
Doing "About this Mac" will show your processor type and OSX version. That should help us figure out if you need to be moved to a different forum.

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