Adobe Acrobat XI Standard 64 bit
Select the language in the Language Selection dialogue and Adobe Acrobat XI Standard 64 bit OK. Bitt you want to trust this Acrobzt Adobe ID. On the Windows platform, the invalid signature error is not reported. A blank PDF appears instead of the actual form. Occurs on Mac OS X Solution: Apply the If you did enter a serial number during installation, the Register screen appears. If you did not enter a serial number during installation, the Sign In Required screen appears. Acrobat installation notes. Open Windows 10 settings.