Unable to enable an old HP Officejet Pro 8600 N911g's web service.

Hello.

Old (2012?) HP Officejet Pro 8600 N911g's web service won't turn on from 
its internal embedded web server (its home page says its web services is 
not registered to ePrint), physical screen controls, and in mac OS apps 
(https://ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Applications/HP_Easy_Start.app.zip 
2.10.0.201112 and Apple's App Store's HP Smart app).

The printer does have an internal IPv4 address that I can access over 
wifi. Wireless (e.g., AirPrint) print works too. It doesn't seem to 
connect to the Internet or something? I don't think its web services 
stuff was enabled ever. I don't see any option to test its Internet 
connection.

I am trying to enable so I can download and upgrade its firmware, but 
can't acccess its web services. I don't have a Windows PC to upgrade 
from 
https://ftp.hp.com/pub/softlib/software13/printers/ojp8600n911_2011A/OJP8600_N911g-n_2011A.exe 
and can't find its macOS firmware updater since it is on old CKP1CN1829AR.

The printer does print and scan just fine locally though.

Thank you for reading and hopefully answering soon. :)
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