If you have a Git GUI, you probably also have Git Bash, which provide command line support for Git inside Windows.
You can use this Git Bash to download your project. To do this, you just need the git command, and you do not need to register with the Gitlab server (I suggested why you tried this). This command is provided by Gitlab when you create a new project and want to download it.
First open Git Bash. Then:
cd c:\Users\Me\..\my_project\
It is also a good ideal to provide Git with some information about you. This information will be displayed by Gitlab:
git config --global user.name "Your Name" git config --global user.email " your_name@your _mail.com"
Remember that with Gitlab, the only interaction between your Git repo and Gitlab should be with the git command, not with the login to this server.
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