I tried to repair different issues in individual installations of SW2012 and SW2014. When I run the Repair Option from the Installation Manager there are always missing files. I have not deleted the installation files and they are in the same directories as in the time of the installation. I even keep the installation files of two service packs of SW2014 SP3.0 and SP4.0 but only the latest SP 5.0 of SW2012. in my opinion the repair should find all the needed files form the latest SP set of files. Can  the repair be run successfully on SW2015 PR1 ? - I don't have it installed.