Hi,
I have the exact same issue.
I have Gravity 2 PDF Version 2.1.8
My System Check page says PDFTK Library Fail.
Temp Path and PHP version both PASS
So the issue is the PDFTK Library not found.
When I go to Settings Tab, there is no more option to use Gravity2PDF’s PDFTK library anymore. No option at all.
Only shows Temp Path.
Please help