Plugins - Create PDF - Test Failed! is using https
It turns out that its was the temp directory...
I added temp directory setting before the createPDF_fromOutput call and all is working!
$GLOBALS['CREATEPDF_TEMPDIR_PATH'] = '/home/account_name/public_html';
It's going to take a lot of memory, I'd recommend seeing if you could generate them individually and then merge them. You might need to try a few additional command line binaries for that.