No wonder then, if the installer never closes, then a group of mods will never be installed properly.
Try to manualy move all files from res_mods/version/ to res_mods/0.7.5.0/
Why the installer is not finishing its job for you? Well, it's always a local problem. Might be many things, like your antivir, lack of admin rights for the installer, files got locked, file permissions issue and in the end they cannot be moved etc.