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As anyone who reads this forum is aware, spurious errors are prevalent with version 1.12.3. I was not having issues with it until this week, but I also was not ripping a lot of stuff.
But I have been pushed back to 1.12.2 because it is not throwing errors on just about everything like .3 is.
So, until Mike replaces 1.12.3 with a version that isn't broken, my personal recommendation is to go back to 1.12.2 unless you need to create a UHD dump file.
Where to find 1.12.2: https://makemkv.com/download/old/
Why you might need 1.12.3 installed: UHD dump file format changed at 1.12.3, and new submissions for "missing keys" need to be made with 1.12.3 or later.
You CAN install multiple copies of MakeMKV, so long as they are in different program directories. And versions 1.12.2 and 1.12.3 can even share a common MakeMKV data directory.
But, if you're not doing UHD disks, I would not bother with having both versions installed.