Hey - let’s see if we can deduce what’s happening with 4.9 build. As of 4.9 we pick up system svn version to use, before falling back to our pre-built binary that’s shipped with UE4.
Here’s a couple of things to try and report back on:
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What path is being reported for svn operations in UE4 log? You should see a log message on startup along lines of “Using path /bin/svn for svn operations”
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Please try running additional set up commands mentioned in this article with but instead of cd-ing into engine directory, use directory reported in step 1.
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If it’s still using version we ship with UE4, try overriding it to use your system version, if you have one installed (add ExecutableLocation=/path/to/svn to [SubversionSourceControl.SubversionSourceControlSettings] in SourceControlSettings.ini), then repeat step 2.
Let us know if you get any mileage with any of these options