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A manual upgrade (I ran "msiexec /p ParityAgent6.0.2msp /l*v c:\parity-upg.log") resulted in a failed upgrade.
This appears to be an inability to stop the agent due to increased Agent hardening introduced in 6.0.2. tamper protection is on and should be on for all updates.
Enhancements in tamper-protection requires that the entire path be defined in the command.
When upgrading Parity, the full path to the MSP file must be used or the installation will fail attempting to stop the Parity service:
msiexec /p C:\SomeFolder\ParityAgent6.0.2.msp /l*v C:\Upgrade.log
If the built-in upgrade process is used, these steps are taken automatically.