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Thunderbird keeps crashing before it can even open!

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While trying to open the program, I get a popup saying it crashed & giving the options to restart or quit. If I go for "restart", it pops up again after a couple of seconds. I had both versions 52 & 68. I uninstalled #68, but when I try with #52.1.0, I keep getting a message that says, "Your computer must be restarted to complete a previous upgrade of Thunderbird." When I restart, the SAME cycle repeats ad nauseum!

While trying to open the program, I get a popup saying it crashed & giving the options to restart or quit. If I go for "restart", it pops up again after a couple of seconds. I had both versions 52 & 68. I uninstalled #68, but when I try with #52.1.0, I keep getting a message that says, "Your computer must be restarted to complete a previous upgrade of Thunderbird." When I restart, the SAME cycle repeats ad nauseum!

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