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Horizon Agent 7.6 installation fails with "Error 1920. Service VMware Blast (VMBlast) failed to start."

  Symptoms

When installing(fresh or upgrade installation) Horizon Agent 7.6, the installation may fail and show the following error dialog. 
"Error 1920. Service VMware Blast (VMBlast) failed to start."

The installation then rolls back.
Cause
The log4cxx.dll bundled in Horizon Agent 7.6 does not have Product Version information. The log4cxx.dll bundled with older versions of Horizon Agent contains version information.  This issue will happen when the Horizon Agent 7.6 is unable to delete the log4cxx.dll belonging to earlier versions.
As a result, the Blast Service (which depends on log4cxx.dll) will fail to start and the Horizon Agent 7.6 installation will not succeed.
Resolution
This issue has been resolved in Horizon Agent 7.7.
Workaround
If you need to install Horizon Agent 7.6 instead of using a later Horizon version, then delete the C:\Program Files\VMware\VMware Blast\log4cxx.dll (or the entire VMware Blast directory) manually before installing Horizon Agent 7.6.

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