I am not sure if this will take care of your issue, but there were 2 things I had to do when I installed 8.0 version.
1. Added the path to the Java executable, not the path using programdata,
C:\Program Files (x86)\Java\jre1.8.0_71\bin is what I added to the path statement.
2. I could not double click and install the UR as it said, I had to go to command line and run
installUR.exe -gui
Then the install completed .