LaserJet Printing

Upgraded from Win 8.1 to Windows 10 x64 yesterday.

My printer is a ColorLaserjet CM2320fxi connected via Ethernet (fixed IP in local address pool).

The computer has 32GB RAM, 4. generation i7 CPU and plenty of disk space. No scarcity in any of the requirements.

After the installation HP Scan + Fax didn't work any more. Unknown devices were shown in the device manager, no drivers could be found online or locally.

Printing (all UPD drivers) was still available and working.

Took a look at the HP support pages and learned that the full solution 3.1 —

http://h20564.www2.hp.com/hpsc/swd/public/readIndex?sp4ts.oid=3597341&swLangOid=18&swEnvOid=4192

— is supposed to still work with Win 10.

Tried to reinstall the AiO suite. The installation went exactly to the point where the network printer was identified and some DOS windows in the backup were copying drivers. It stopped at a point were the setup process nagged about a missing unidrv.dll in a nonexisting folder: 

C:\Windows\System32\Driverstore\FileRepository\ntprint_inf_amd64_***\i386

Don't remember the exact wording of *** above right now; anyway this folder string seemes quite strange; either it's AMD64 or (exclusive or)  x86/i386, not a nested combination of both. Even on a machine still running on Win 8.1 there didn't exist such a folder.

I tried to manually insert the pathes to several versions of 'unidrv.dll' libraries I found on my system; to no avail. An empty box (absolutely no text) popped up, clicking 'Ok' or closing being the only choices. Afterwards the setup program reproducibly insisted on finding the network printer again and run into missing unidrv.dll — again and again and again.

Stopped the installation. The deinstallation wizard failed miserably and messed up my system.

Restarted my computer and tried to install the HP suite again. Installation failed directly after starting, stating a warning my OS isn't supported and an error The installer can't be run as (sic!). This also happened when I explicitely started the installer as Admin.

Did a manual uninstall,  scanning the registry and file system for remnants of of the CM2320 and deleting all of them.

Restarted the system, tried to install the HP suite again. It stopped exactly at the point where the network printer had been identified and some DOS background windows were copying drivers — with a totally empty box popping up, , clicking Ok or closing being the only choices. No grumbling aboput missing unidrv.dll this time. Installation started again from the point were the network printer needed to be identified. Placing a version of unidrv.dll into the extracted temporary installation folder didn't change anything, the procedure turned out to be an endless loop failing over and over with an empty box popping up. Finally stopped installation attempts.

Learned the built in Windows 10 scanning app is able to handle the CM2320 scan module, thus there is a kind of workaround for this part. No makeshift for faxing so far.

Thus the nearly identical driver structure for Win 8.1 and Win 10 (cite HP support regarding Win 10 upgrade) seems to have some strings attached, especially when some complex installers are involved.

Right now it's not possible to install the HP AiO suite 3.1 on my computer running Windows 10 x64 (upgraded from Win 8.1). Havn't tried installing the HP AiO suite on a bare metal (clean new install of Win 10) so far as reinstalling all needed programs would take two days or so.

Is there some workaround for faxing, too?

Does HP plan to publish an updated AiO suite for Win 10?

Or has the CM2320 entered the realm of old devices not being supported any more as seen before many times?

I appreciate any hints.