When trying to upgrade to vRanger 5.2, the error come
"vranger backup and replication version 4.5.3.17315 is installed on your system. Would you like to upgrade it to 5.2.0.22058"
errror message "vRanger Pro service cannot be stopped"
When Yes is selected then it proceeds thru the screens and tries to stop the old 4.5.3 services "vRanger pro service" which no longer exists and this old service was removed in the previous upgrade.
This should be able to resolve this issue.
Click Start, the Run.