i have an older mac high sierra 10.13.6 which software update do i use
i have an older high sierra mac, what software update should i use
iMac 21.5″, macOS 10.13
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You can upgrade up to Monterey 12.6.2 in that case. Catalina and later are 64bit only so older 32bit apps will not run. You can check which you might have using Go64.
You can upgrade from here: How to download macOS - Apple Support