It seems support for the WorkCentre 7775 has been removed from the current version of the Global print driver.
The version available late November 2019 did have support.
Is there a link to the previous versions of the Global print driver from about that time (or the last version that supported the 7775)? PCL6 V3, 64 bit
Thank you for using the Support Forum. Here is the global driver that includes the WorkCentre 7775. Please consider contacting your support centre for further assistance.