I am having the same issue. After being unable to update to Beta 4 (even though I had applied all previous beta upgrades), because the upgrade wouldn't recognize FE as installed in the system (yet it was installed and operational), I downloaded the full beta 4 setup. After executing the setup, it takes a couple of minutes to start up, then UAC pops up asking for confirmation and then, once confirmed to proceed with installation, a "File is corrupt" message pops up. So I tried to download
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