![]() ![]() The problem comes in preventing TB from clobbering an existing installation, which can happen either because it doesn't give me any choice where to install once it discovers that TB is already installed somewhere, or when it clobbers windows registry values that I may have changed. I use multiple profiles anyway, so like I said copying one of them is not a problem. But in recent times, TB does more and more stuff behind my back, and I have been bit somewhat below my back by it. ![]() I don't generally install in the default places when given a choice, regardless. I would just install in a new dir, which I have done in the past. (specifically, in Linux, I install the test version under '''~/opt/Thunderbird''', whereas the regular version lives at '''/opt/Thunderbird'''.) In my beta testing, I install Thunderbird into the user folder rather than the generic location under "Program Files (x86)" or whatever it is called. You'd still have to make sure that the old and new Thunderbirds were installed in their own folders so as to avoid the the test version overwriting the standard version. ![]() Backup your working profile and install the test Thunderbird over the old one. If this all sounds like too much hassle, just follow sfhowes' suggestion. (specifically, in Linux, I install the test version under ~/opt/Thunderbird, whereas the regular version lives at /opt/Thunderbird.) We set it up in a new user account, or in a new instance of the OS in a virtual machine.) (This is how beta testers test Thunderbird. Or rather than trying to run multiple Thunderbirds independently, you could use an alternative user account for testing that account would have its own profile and therefore avoid the danger of the new Thunderbird damaging your working profile. ![]()
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