Hi Sparven,
This is a known issue. The SVN binaries the editor uses for its operations accidentally didn’t get shipped with the Launcher version of the editor (GitHub users should not be affected), so it is currently unable to interact with Subversion.
If you want to use SVN with the Launcher version, you can work around it with the steps below. Fair warning, though: this is not an officially supported workflow, so use at your own risk.
- Go to http://www.visualsvn.com/downloads/ and download the Apache Subversion command line tools.
- Open the zip file and go into the “bin” folder.
- Open Windows Explorer to your engine installation path’s …\Engine\Binaries\ThirdParty\ folder (default would be C:\Program Files\Unreal Engine\4.0\Engine\Binaries\ThirdParty).
- In ThirdParty, create a folder named “svn” (no quotes).
- In “svn”, create a folder named “Win64” (also no quotes).
- Extract all of the EXE and DLL files from the zip file’s “bin” folder into “…\svn\Win64”
- Start up the editor and enjoy using SVN.