I tried to install one of my packages using VI Package Manager 2013 and was surprised to see the error message "This package is not compatible with any LabVIEW version on this computer."
The package is supposed to be compatible with any LabVIEW version >= 8.6 and I have 2013 installed. After some Googling, I found this: http://digital.ni.com/public.nsf/allkb/9A84C532AB9268BD86257CEF00794E70
It turns out that I had compiled the package using VIPM 2014 and thus it is not compatible with VIPM 2013. I suppose that this makes sense but the error message shown in VI package manager is very misleading.
So in conclusion... Keep VIPM up to date otherwise you might get misleading error messages when trying to install new packages.