This question is in reference to Atlassian Documentation: Downloading and Connecting HipChat Apps
Where do I find older / old / archived versions of hipchat client?
(in the past 6 months or so is fine
For obvious security reasons I don't trust third party sites that claim to have them.
All I can see is the button/ link for the latest https://www.hipchat.com/downloads/latest/newqtwindows
If you know the filename, you should be able to find the older version by taking the current download URL and changing the filename at the end.
For example, here is 4.2.5 for Mac:
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