Problem reinstalling Mac OS

Hello!

I have a MacBook Pro of 2006, that had Mac OS 10.7.5 installed on it, OS X Lion (10.7.5 was the last version for this laptop). For a lot of problems, I needed to format it.

The problem is that, when going for installing the Operating System, it says “This article is at the moment not available”.

I have read online that login with an old Apple ID should work, but for me it doesn’t work.

BUT I have a iMac of 2012 (Upgraded to the latest OS, Catalina if I recall correctly). Can I use this to reinstall the MacOS on this old PC? If yes, how do I do it?

PLEASE, do NOT post some guides that only works for newer versions, because I need a guide that works with this very old version, please!