leob

Don't know if you saw my original reply to that post by now, but PDFTron sells hi-end frameworks that are out of reach for regular developers.

Ghostscript works for me on Big Sur, I use the installer from here: https://pages.uoregon.edu/koch/

try a clean user account - create a new account in System Preferences and try there.

Hi all, I'm the developer of PDF Checkpoint. A user pointed me to this discussion and it's good to see PDF Checkpoint mentioned on your forum. As someone correctly mentioned earlier, PDF Checkpoint is indeed no match to hi-end tools of Adobe and Callas, nor it attempts to be such a tool (not yet at least). PDF Checkpoint targets users who need affordable basic PDF preflight and conversion. There are many plans for further development of PDF Checkpoint, with separations preview and ink coverage being considered as well. However, there's no specific timeframe for this yet as the current major upgrades of InDesign plug-ins take priority. If you have any questions or specific requests for PDF Checkpoint I'll do my best to address them. Also, while myself researching the separations preview options I recently came across a tool that hasn't been mentioned here. I think many users will find it helpful. Check out the free viewer here: https://www.packz.com/downloads-info/ The download link is on the registration page. I'm not associated with this company in any way. But I thought it'd be good to share this info especially that their tool isn't a competitor to PDF Checkpoint anyway (not for the foreseeable future at least). Thanks, Leo

PDFTRON offers extremely powerful hi-end PDF SDK tools. They're also - and understandably - priced accordingly and are out of reach for small developers.