Acrobat DC Pro Won't Open - Windows 10

Dear Forum Users & Mr Adobe...
Looking at the Forum, a number of people are encountering the same issue as me...

I have had problems opening PDF files progressively over time (past 6 months) and I reached a point where none of the files I had previously opened/edited would open by double clicking the file, or right clicking the file and selecting <File Open>.  I could open via the back door, viz. Open Acrobat then open the file, however the files would eventually lock up & crash...
I recently upgraded Acrobat to 64 bit which made the problem worse, such that I couldn't open any PDF files at all.
By running the Windows Task Manager I found that Acrobat was running as a background process, force stopping it and restarting did not fix the issue...

I de-installed Acrobat and used the AcroCleaner tool for both DC2015 Pro & Reader & DC2022.

I then reinstalled Acrobat, via Adobe Creative Cloud, which automatically installed DC Pro 64 Bit.
And hey presto, I still could not open any PDFs.

After searching Dr Google I found this...
Using Fix No.4 which entails disabling Protected Mode via the Registry my problem is solved, I can now open all PDFs seamlessly...

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https://www.makeuseof.com/windows-adobe-acrobat-reader-not-opening-pdf/

The following is an excerpt from the above website...

Protected Mode is a security feature introduced in Reader 10.0 that protects users from viruses and attacks. This is a good thing for your security, but it sometimes misinterprets files as malicious and doesn't open them correctly.  (Sometimes?!)

As such, you can try temporarily turning off this mode to see if it's preventing the software from opening PDFs. Here's how to do it:

• Press Win + R to open the Run command.
  Type Regedit and tap Enter to open Registry Editor.
  Paste the following address into the Registry Editor.
• Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown

Right-click and navigate to New > DWORD Value.

• Rename the file to "bProtectedMode."
• Right-click the file and tap on Modify.
• Change data value to 0 to disable Protected Mode.

Run the PDF file again with Protected Mode off. Keep Protected Mode off if everything works well this time instead of having to turn it on/off many times throughout the day. Of course, this will compromise your security, so it's up to you to decide if it's worth keeping off!

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Thankyou Adobe for running protected mode in the background and not telling your customers.
And I would like to undertand Mr Adobe, what is the purpose of this "Protected Mode", and who exactly is it you are protecting, your cloud??  I run both Virus & Malware Protection on all my machines.  So what is the purpose of you locking my PC down?
You are in breach of my Privacy!!

Please also note Mr Adobe you have wasted 5 days of my time this month while I have dealt with your under performing "Product".  And I now must set up all my settings (again).  Are you going to compensate me for this time??

And Mr Adobe, don't you dare modify the registry on my PC and blow my registry settings away the next time you deliver me and "upgrade"...
Can I come along and adjust the registry in your machines?  I seriously doubt it...