Hi! What do you mean that the login screen does not appear? Are you getting a blank screen?
In that case, this issue has already been reported in our bug tracker at SRCTREEWIN-7244. There are a few workarounds listed in the comments, there's one specially that seems to be working for most of the users so I'll copy it here for you:
From a working install collect the accounts.json and passwd files.
Delete the Atlassian folder from the AppData/Local directory for your user. Run the installer for 2.3.1, close it when you get the blank login window. Place the account.json and passwd files into the Atlassian/SourceTree folder. Rerun the installer. It should detect the account and password from those files and bypass the request for a login.
Some users shared other tips too, so you might want to check this Community thread.
Let us know if it worked for you! :)
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