Download Sequoia older version for a different Mac

My wife's M4 mini was destroyed by the last update. I would like to go backwards. I have a timemachine back up made on that computer which now says I do not have permission. I am able to open that very version of Time Machine back up with my M2 mini.

I want to go backwards to 15.2. How do I find legacy installers? 2 attempts to download the 15.4 get installer errors,

Does anyone know where the older versions of MacOS Sequoia installers are located?

[Edited by Moderator]