The installer is an NSIS installer; note that the S for the silent install is case-sensitive. Otherwise this is very straight-forward.
To install:
Setup.exe /S
Post-install, PowerDVD requires a license key to be entered and a first-run, and I could find no way with NSIS to automate the post-install requirements.
To uninstall:
"C:\Program Files\NSIS Uninstall Information\{729D20C8-FC13-4BE9-B0BB-E86F76600647}\Setup.exe" /S
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