Hey Markus
ok so i go through the install of RU 5 , and it tells me it was succesful. I reboot the server, then i install the HOTFIX and get :
DPM update installer has detected that following required prerequisites are missing. Install these and run DPM Update installer again.
1.A required hotfix KB3021791 is missing. Install it from http://support.microsoft.com/kb/3021791
so i tried again and install the RU 5, went through ok . and then same issue with the hotfix.
if i go to ABOUT DPM , the version shows R2 4.2.1297.0 , is there a way to confirm that RU5 is succesfully patched ?
Also i keep getting MMC crashes when i go to reporting tab. i tried the workaround to backup SQL DPM database manually and run the script. (https://social.technet.microsoft.com/Forums/en-US/6e8bbabc-089f-42f1-8af1-8715df4a33a8/problem-with-dpm-2012-r2-console-after-install-ru5?forum=dataprotectionmanager)
restart and same issue MMC Crashes... so annoying