Don Spam's Reckless Son wrote:
Be warned that "running both versions at once" is a very dangerous - ok, suicidal - thing to do with those two versions.
When you move from a 2.49.x (or older) version to a 2.53.x version, the profile undergoes some migration reformatting which renders part of it useless for 2.49.x levels. That is the reason for THOSE BIG WARNINGS IN RED IN THE RELEASE NOTES which you should have seen.
Something that I neglected to mention when I noted that I have had two versions installed simultaneously is that it's essential that each version have its own profile.
This is something that comes from Firefox since about version 54 or 55, in that profiles are not backward-compatible. In Seamonkey, that means that if a profile has been used 2.53.x, then if you try to use the same profile again in 2.49.x, there is significant chance for data loss.
Although I may be annoyed that the upgrade-in-place tool has been broken for several releases, I still consider that to be something of a positive thing. If I have to manually download and install a new version, then it's a good reminder to make a backup of a profile before I install. Then, if it turns out that there's a reason to revert to the earlier version, I still have a copy of a profile that's known to work with that version.
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