So I have been installing alot of Acronis Agents recently, and three times i have come across Acronis error 1603.
Whilst there is lots of different info out there to try to resolve this issue, i have found one that has worked every time in multiple different environments. Lets get straight to it:
To solve Acronis error 1603:
Simply run the cleanup tool. It can be found here:
http://dl.acronis.com/u/support/abr_cleanup_h.exe
And run it from administrative CMD using the following command:
abr_cleanup_h.exe --clean
Hope it helps, if it does, let me know!