An Adobe DC continuous track application can be installed without an Adobe account by 'serializing' it. Installations downloaded via the licensing site, without a volume license, seem to rely on an online Adobe account to finish activation even after inputting the serial number. If a 'classic track' version cannot be found it may be able to be serialized via Adobe Provisioning Toolkit Enterprise Edition (APTEE), simply referred to as PRTK tool.
adobe_prtk --tool=Serialize --leid=V7{}AcrobatESR-17-Win-GM --serial=0000-0000-0000-0000-0000-0000 --regsuppress=ss
The value for leid will vary depending on the product you're trying to activate. Obviously, enter the customers serial.