When previous versions of the SoftGrid Client are originally installed via GPO, a subsequent upgrade to the SoftGrid 4.2 may fail with 1642, 1606 and 1603 installer errors. On the client you may also see the following error:
The SoftGrid Client could not be started.
An unexpected error was encountered. Please report the following error code to your System Administrator.
Error code: xxxxxx-xxxxxx 12-00006002