Hi @Grlyogesh , welcome to the Community!
we'll need more information to help you troubleshoot this issue:
Let us know,
I'm also having this issue.
I am trying to install v3.3.8 (also have the same problem with v3.3.6).
I can authenticate just fine to the bitbucket.org website. The error message is when it is trying to do the OAuth callback to the installer application.
I have tried setting my default browser to Internet Explorer, Chrome, and the new Microsoft Edge browser. All have similar results.
My computer is fully updated. I'm not using a proxy. I'm unable to use another network, however I'm fairly certain it isn't an issue networking with my network, rather the callback to the installer.
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