Hello,
We recently successfully upgraded our Horizon connection servers to 7.13 (from 7.8). However, I am having difficulty getting the 7.13 agent installed on my windows 7 golden image. I have successfully completed this on my Windows 10 image.
The install progresses along and all of a sudden it says "rolling back" and the green progress bar goes backwards. 
We are running Windows 7 Enterprise SP1 64-bit.
Has anyone else had this issue?