Sigh. Latest update to Creative Cloud Desktop app has caused older versions of Mac OSX to no longer sync files. Works on Mojave, High Sierra and Sierra. Won't work on El Capitan back to Mavericks.
If you are going to break these things regularly could you at least post a download link for the previous version of Creative Cloud desktop so people can downgrade to the last working version or better still don't allow the update to go through on non-compatible versions. Or even better still, TEST the updates on all versions of OSX BEFORE you release them to make sure they work. Multi-billion dollar company like Adobe. How hard could that be? Remember, your customers pay you for this woeful product and service.