From the project root, call the context menu (right-click, assuming you're right ;-).
Choose TortoiseGit > Revert...
The Check In dialog box displays all the files that you changed in your repository. You can select the ones you want to return by checking the box and then clicking OK.
This returns the selected files to their original state.
Then you can get the latest versions of these files from the shared repository using the Pull ... operation from the TortoiseGit context menu (of course, you might want to commit other changes that you have locally).
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