: Open Reader and go to Help > About Adobe Acrobat Reader to confirm the version number.
The v3001 error code is typically a vendor-specific flag indicating a "Signature Verification Failure" or a "Modified Script Block." When you use a patched version of Adobe Acrobat Reader x64, the internal checksums of the installer are altered to bypass licensing checks or change default behavior. Windows Installer (MSI) and Adobe’s own background services detect these discrepancies, leading to an immediate installation rollback. Common Causes: patched adobe reader x64 fixes v3001 install
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\DC6EFB56-9CFA-464D-8880-44885D7DC193 Correction : Verify the value. It is often incorrectly set. Change it to 534A1E02-D58F-44f0-B58B-36CBED287C7C : Check the same path Wow6432Node and apply the same change if it exists. Common Troubleshooting Error PDF Preview Handler - Adobe Community : Open Reader and go to Help >