Maybe @HIRAM can post a link to a 5.6 Mac version
http://web.archive.org/web/20170907215940/http://rawtherapee.com/downloads/
For example.
The internet is a wonderful place.
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Taking into account that the Mac version provided is a custom compilation made by a fellow user, you can thank him for his work, and give Parallels Desktop Lite a try: you can install a linux os and use any appimage.
If you don’t find any, I can share them from v.5.5 upwards
For me the old versions appear here:
https://www.rawtherapee.com/downloads/
Just tried the download for 5.5 Mac OS works flawlessly
Thought the links to download the old versions do not work for 5.6 
Actually, only the 5.6 download page seems broken. The file is actually there @carlos1960 https://rawtherapee.com/shared/builds/mac/RawTherapee_OSX_10.9_64_5.6.zip
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Who do I ping for the website?
Only the top pixels of the buttons work on the 5.6 download page.
Edit: and this is why:
I really don’t know how to thank everyone. I just did a job of architectural interiors for a new client this morning and I was going to look really bad with him if I couldn’t show him the finished work.
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As @Thanatomanic detected: Only the top pixels of the buttons work on the 5.6 download page.
That should be fixed. Nevertheless thanks for helping @carlos1960 to download a 5.6 build 
Great that the community is available to help someone who needs RT for its job and does not make backups 
Sorry, @carlos1960, couldn’t resist
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It is the first time that I have such a problem with RT that I use from at least three versions. I will activate Time Machine from now on … 
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Or rely on the community. Seems to work as well 
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…sure…
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Hey sorry, its me who didn’t link the old versions yet. All of them should still be there though!
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… thanks but check the operating system icons on the version 5.6 page, when you pass over the mouse they activate only on a small portion and the link seem not to active.
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!
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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.