I don't know how to get the older clipboard to work but here's an alternative anyways:
It's a pain to get the new clipboard to turn off completely however adding a registry key and restarting system disabled it But the Win+V key couldn't be assigned to another application.
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System
New D-Word 32 bit Value:
AllowClipboardHistory
and set it's value to 0.Then I just installed a third-party clipboard, in my case: ArsClip (which isn't on GitHub but the source code is included with the file for security audits if you want to).
Workaround to get the Win+V to work with ArsClip:
Install PowerToys and inside it remap the shortcut Win+V to something very obscure that will never use like Ctrl+Alt+Shift+End and in ArsClip add this obscure shortcut to open it.
This way the Win+V opens up ArsClip.
P.S: Yes, it's not really the perfect solution as you asked for getting the original Clipboard back from the golden days but I don't know how to get that working and I won't look into it as ArsClip gets the job done and it has a lot more features that I never use already.
ni6hant