I tried with signing out and in and it worked! Now I can download my projects again! Thank you @sven
I'm not very expirienced with command-line git! But I can handle visual tool like GitHub Desktop App. And I really like that I can commit only what I want, insted of having defold staging and pushing everything! (And after that push I can not revert specific files...) So I need to get this working!
# Edit: ok, here's what I found out...
If you want to push commits manually to defold's repo (dashboard), you are out of luck with the GitHub Desktop Client! As soon as you change the origin remote url, the defold IDE can't relate to it anymore. On the other hand you can't push through the GitHub Client to remote repos other than the ones at github.com. So basically you break everything.
Changing this will break the link between Defold IDE and the online repository.
What you want do instead is using SourceTree, as @sven advised. Just drop your local branch (git repo) into it.
Open your repo (double click) and now you can see all previous commits. Now you can normally work with defold IDE and every time you need to save a progress step (commit) you go into SourceTree and make a commit. This is also the place where you can decide which file changes to include into a commit and which not (staging). When you push commits to Defold's repository (dashboard), SourceTree will prompt you to type in your login. Use your eMail as username and your access token as password. Sometimes you have to type the password multiple times (once per git operation).
Additionally, if you want to maintain a separate copy of your repo, you might add an additional remote server (such as bitbucket). Don't mess with the
origin name here, if you are not experienced! This might mess up connection between defold and its repo again! Just add a second repo. Now you can push to both at will.