Be aware, that the MSI installer has no support for Netscape-/Mozilla-based browsers!
The custom action works just fine, but [%APPDATA] doesn't get resolved (environment variables are rather scarce under the local system account). Replacing it with [AppDataFolder] has the intended effect of the vendor.
The installer at the link listed here doesn't include the latest version of Flash (version 8.0) - and I don't think Macromedia currently has plans to update it to include the latest version.
MsiExec.exe /i file.msi /q REBOOT=ReallySuppress
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