A little late but we store all the old software versions automatically:
If there’s someone from the RawTherapee team that can provide a source where to upload the legacy versions or all of them, please PM me.
I will be happy to upload everything there. Or we can provide access to our platform and let one or more team members handle this.
P.S. We listed RawTherapee recently that’s why we have only two previous old versions.
Thank you!
This was actually fixed in a recent commit, we just haven’t pushed it to the live site yet. If you hover over the top half of the button it should work (as you’ve noticed already 
).
I should add a link to this, but all of the builds are located in a directory here as well:
https://rawtherapee.com/shared/builds/
@carlos1960 - thanks for bringing this to our attention!
Nope, I fixed and cleaned up the old downloads 9 days ago in commit b44785c. This is a separate issue.