Hi Ronnie,
Registering an OCX/DLL comes down to writing entries in the registry under HKLM/HCR.
Non-admin accounts by default don't have rights there.
Via regedit you can give rights by right-click on registry hives and choose Permissions...Full Control.
Alternatively registering the OCX/DLL through GPO can be your friend.
This said, Appeon does NOT require admin rights to run a Web application (IWA was delivered from Appeon 2016, check limits in Appeon help), but has no power on OCX/DLL registration if admin rights are needed.
HTH,
Marco