Im a Mac user and Ive been looking at an error on a recent clean install of Download Assistant.
Mine gives an error everytime it loads saying it can’t find one or more of three key apps that Steinberg products need.
2: Steinberg Library Assisistant
3: Steinberg Installation Updater (v18.104.22.1689 is latest)
Its this third one which has failed to install so constantly generating the error on every load. This seemed to happen for me on Catalina (10.15.7) It may be a new bug in the latest DLA (v1.20.2) as it did not happen on a previous OSX build or it may be because the last install was via Mojave.
If you go to your About this mac / System Report / Applications and scroll to steinberg what do you see listed?
I have an entry for Steinberg Download Assistant v 1.20.2
Steinberg Install Assistant v 22.214.171.124
Steinberg Installation Updater (missing v126.96.36.1999 but on previous install)
Steinberg Library Manager v188.8.131.526.
These entries will show where on your machine these apps were installed.
My recent DLA install also put some odd folders under Users/Username/Application Support/Steinberg/Download Assistant. Application support files normal are a subset of Library. So no idea what these have been created for. They are empty folders.
Im still trying understand the purpose of the missing Steinberg Installation Updater app and the Steinberg Install Assistant. DLA places these on the system but dont know whether its an either / or choice of which app gets installed as I do not know what they do.
This might assist your troubleshooting.
Any feedback on your findings would also assist me.