Sorry I didn't post this earlier. I'm still working with the new forum member 10 post a day limit and I had to wait for it to reset.
alright, I figured it out. There are two scripts that reference Alfred 2. I just went and looked at each script. There's en_pref.scpt and q_workflow.scpt. I changed it in those, saved 'em, and I'm in business! It now seems to be working perfectly. I wonder if you're now having issues because you also have Alfred 2 installed. I've only got Alfred 3. Changing those elements in those two scripts seems to have done the trick. Thanks so much for your help!
This workflow is awesome, thanks! I just installed and tried it out, I knew I had a task that I'd set a due date for within a few weeks. I normally live in my "today" perspective in OmniFocus. To find this task I would've had to made OF the active app, changed perspectives, clicked into the search field and typed my search term. Instead I just used this and it found it right away. Great stuff.