When I try to get mac OS Catalina 10.15 upgrade on my Mac Book Air 2017 it says that your version is too old
When I try to get mac OS Catalina 10.15 upgrade on my Mac Book Air 2017 it says that your version is too old
MacBook Air 13″, macOS 11.4
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Downgrading from Big Sur to Catalina will depend if this actual computer came Pre-Insatalled with Big Sur. If it did come with Big Sur when it was New - you can not downgrade at all. Apple will not allow this.
If the computer came with an earlier version of macOS as New - then yes it can be downgraded. The easy way Revert your Mac to a previous macOS version