28 mac update - what do I have to do to prepare my apple iMac for release 28

Cranky16804 wrote: 28 mac update - what do I have to do to prepare my apple MacMini 2 for release 28

We don’t know some or much or all of what might be required for a macOS release that won’t be available until sometime next year, past details such as the end of Intel app support, and the end of encrypted HFS support, both of which Apple has announced.

Here is what Apple suggests for Intel apps: Using Intel-based apps on a Mac with Apple silicon - Apple Support

And for HFS+ encrypted volumes: About support for encrypted Mac OS Extended disks in macOS 28 or later - Apple Support

Get rid of any "cleaning", "optimizing", "speed-up", anti-virus or VPN (unless required and supplied by your employer, bank or school) apps on your Mac and their supporting files.

Actually, that should be done whether you upgrade to 28 or not.