won't start after update to 52
I installed the Thunderbird update to version 52. Since then it will not start, Windows 7 says "incompatible application." Restart, restart in safe mode, and all other windows options like compatibility do not solve the problem.
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Something went wrong during the install.
To be safe, backup the your Thunderbird Profile folder. The default location is: "C:\Users\**windows username**\AppData\Roaming\Thunderbird\Profiles\xxxxxxxx.default" Where the xxxxxxxx is 8 random letters & numbers, and the part after the period is the name of the Profile.
Copy, do not move, the folder to another location for safekeeping.
You will need to turn on Show Hidden Files and Folders to be able to see these folders.
Thunderbird stores all personal data such as messages, address books, calendars and configuration settings in a hard drive folder called the Profile. This folder is separate from the installation of Thunderbird. When Thunderbird is uninstalled, it will leave behind your Thunderbird Profile folder, which will be found and used again when you install Thunderbird again. Despite this, it is a good idea to backup the Profile folder.
Once your Profile folder is backed up, uninstall Thunderbird, then reboot your computer.
Since I'm a Windows computer tech, I recommend that you run a Disk Cleanup and a Check Disk now to cleanup and fix file errors. How to run a "Disk Cleanup" in Windows How to run a "Check Disk" in Windows
Download & install the latest version of Thunderbird. It will probably work now, and automatically use the existing Thunderbird Profile.