We don’t want to pay Adobe anymore, so my Dad is looking for an replacement for Lightroom Classic.
He has over 4500 photos in Lightroom and we want a basically drop in replacement.
Any help would be greatly appreciated!
EDIT1: Also, how do we transfer photos out of Lightroom?
EDIT2: All photos are locally stored.
Found this : PhotoLab has its own internal database, which holds all image edits. There is no such concept as catalogues. Personally, I activate and us DOP sidecar files, which can then be transferred with the image file, to other locations on disk without messing up things like catalogues.

Even if the database were to ever corrupt, normally, these DOP files will ensure that your edits are safe
That’s exactly my method.
I don’t use or manage a vast library in software, preferring instead to organise my shots chronologically in folders by year, month, then individual shoot date.
I can move the DOP files along with the Raw (CR3 in my case) files wherever and retain those edits every time I reload them in Photolab.
Plus Photolab doesn’t get so bogged down as a result, with loading entire libraries of photos. It only loads the ones I want to work out.