Disable Touch Pad on HP Laptop running Windows 10.

This guy has the same problem as you and HP forum staff point him to :

https://h30434.www3.hp.com/t5/Notebook-Video-Display-and-Touch/Chiral-scrolling-disabled-in-TouchPad-driver-update/td-p/7372028

Whether you are talking to a live person on the phone or getting someone from email, just make sure that the HP front line person understand that the "old" solutions won't EVER work and he needs to direct you to someone who understand DCH drivers.

If you are not sure how to say it in person on the phone, then it may be easier for you to just copy and paste what I wrote in the 2 threads here and send it to HP by email.

I never had to deal with the actual tech support hotlines before (so I can't give you any advice) but last year I was able to piggyback on manufacturer's front line forum staff and they sent my messages directly to the appropriate people. This is why I suggested to you to find a HP discussion where some HP staff managed to fix an intel or nvidia or realtek "DCH driver/app" installation problem --- and then piggyback on it. The touchpad app problem is new and nobody has any clue on it, but the realtek app problems have been around for 18 months.

JosephT71

   When you say to speak to HP Tech Support, should I be seeking to find a phone number or starting out with the support chat option? I found the following phone numbers:

1 (650) 857-1501 this is an HP customer support #. 

I also found this:

If you need to contact a live person in HP customer service you need to dial 1-800-474-6836 or 1-800-HP-INVENT. To speak with a live agent, you need to say “It is something else” at the first prompt, then say “Home” and stay on the line (typical waiting time is about 5-10 minutes).

Is Customer Support the same as Tech Support?

You need to talk to HP tech support --- NOT the front line people (they know nothing about this problem and will give you the same unhelpful answers) --- you need to tell the front line people to escalate to someone who is knowledgeable about DCH drivers and its associated UWP "hardware support app". You tell the front line people ANYONE knowledgeable to OTHER DCH drivers (doesn't matter if it is Intel, nVidia or Realtek) will be good enough to talk to.

Tell the tech support staff that you already read Intel's warning about catastrophic failures if DCH drivers are installed incorrectly and that Intel specifically warns about trying to roll back to legacy driver. And you understand that these warnings also apply to the Synaptics DCH driver.

https://www.intel.ca/content/www/ca/en/support/articles/000031275/graphics-drivers.html

This is the most CONCISE and technically ACCURATE explanation you can give HP support staff:

You need to tell them that you originally had a legacy synaptics driver (that has a old style control panel dockable to the task bar), and Windows 10 automatically downloads and installs the new synaptics DCH driver (show the version number in the screenshot). Then you ran Microsoft Store to download the "synaptics touchpad" app. The Microsoft Store originally said that you owned the app (show them the screenshot) and but then it turned to "error" (show them the screenshot).

Don't talk about anything else (like trying time lady's solution), it will only mess up the conversation.

Here's a better shot of the first screen shot before it changes to ERROR

Did you search the "synaptics touchpad" in the Microsoft Store and then you try to installed it?

   Yes, I searched for it in the store. Initially it says in the upper left that "YOU OWN IT", then it changed to "ERROR"

When I click on  Synaptics Incorporated I get this page that says 

Or did the "synaptics touchpad" app was already in the pending installation queue and failed to install?

You need to answer this question.