Converting project to newer version

Hey,

I recently updated my version to CC 2018.  Most of my current projects were created in CC 2015.  When I try to open them, it tells me they were created in an older version and need to be converted.  The first few times I did it, it added an _1 to the end and converted it no problem.  But now it doesn't work anymore.  It gives me the screen that says it's going to do it, and when I hit ok, the "ok" becomes greyed out and nothing happens.  It just sits there.  It's not frozen.  I can still cancel, or rename the project, or chose another location but the "ok" remains greyed out and it doesn't convert the project.  

Anybody else have this problem and have any ideas on what to do?

Thanks