Just run MC19 and do a manual backup, which will be your final MC19 backup. Note the location of the backup and file name. Note, you may (should) see a request to make changes when you run MC19 after installing MC23. Allow them. This is registering components of MC19.
Then run MC23. Again, you should see a request to make changes. Allow them.
Restore your MC19 backup into MC23. Allow settings to be restored.
Check everything in MC23.
There were a few settings not saved into the backup for a while, such as TV Channel stuff, but there shouldn't be too much missed. I think there were some changes in the library structure between MC19 and MC20, or maybe MC20 and MC21. Those can cause some issue during a backup restore. If there are things missed, and it is too much work to set them up again, you may need to step up through the versions, or at least install MC20, restore the MC19 backup to that, backup MC20, then restore then MC20 backup to MC23.
I have moved from MC18 through to MC23 one step at a time and haven't had significant issues. If everything does go wrong, you still have MC19 and a known good backup, so you can return to that and try again.
