Hi everybody,
I had the same problem. All my install files were corrupted.
I tried the alexandre's way but without success.
Then I tried another way : after switching off the antivirus (Bitdefender in my case) I'd re-downloaded the install files (Roland Vdrums Friend Jam app in my case). Then I tried to re-install and then!!!! IT WORKS!! Thanks alexandre_lac for your contribution!
Bye everybody and hope to doesn't need your help in the future.
Greetings.