Ok then here is the way. I posted this somewhere but cant find it.
Install Connect on new PC (do not open it yet).
Copy the form dirs from C:\Users\[username]\ArcGIS\My Survey Designs on the old users PC over to
the same spot on your new PC.
In the new users AGOL create a folder with the exact same name as the old users folder.
Change owner all the content in the old users folder to your new user. Making sure to move to the new folder you created.
Back on the new user PC for each form open the .itemInfo file in Notepad.
Look for the two lines
First find ownerFolder and change this to the item id of the new use folder you created above
Second find owner and change that to the new user
Open up Connect and it should all find itself and be good to go.
Hope that all makes sense. Sounds like a lot but we had to do it for hundreds of forms once and did get it to all work. This is not something you do a lot. One owner one form. As posted above if you can change all this to a headless account that can help. BUT keeping a central sync dir of My Survey designs is tough. Connect lets you download copies but it makes crazy dir names and it used to be it did not bring down the media folder. Not sure that was ever changed. Good luck