Can't run program with 'unknown publisher'

thank you for the explanation. However the thing is I am not seeing a message that the program is from an unknown publisher.

"Can't run program with 'unknown publisher'"

"I am attempting to open a program with an unknown publisher"

A little background might help.

Before you run a program, it's very important to be sure that the program is actually what it claims to be. For example: Just because a file calls itself Winword.exe, how do you know it really is Microsoft Word?

Software developers vouch for their identity by obtaining a digital certificate, which is a proof of identity not unlike a passport or a driver's license. Digital certificates are issued by trustworthy organizations called certificate authorities. 

Most people wouldn't begin to know (and why should they) how to check whether a program they want to run has a valid digital certificate, so the operating system does that for you by consulting the list of known and accepted certificate authorities included in the operating system.

So here's what happened: Windows won't open your program because the certificate authority (the 'publisher') is not, or is no longer, on the list of known and accepted certificate authorities. The publisher might have been known and accepted in an earlier list of certificate authorities, but the lists are updated frequently. The April 2018 update, or another update, revised the list of known publishers, and the publisher for your program ain't no longer on it.

None of this was invented by Microsoft, who is simply complying with internationally accepted standards for safe computing.

You're seeing the message because Windows can no longer guarantee that the program is safe to use.

Do you have the option to run as Admin? Right click on the setup file of the program Select Run as Administrator

Disabling UAC might help too.

https://articulate.com/support/article/how-to-t...

Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Thank you for the fast reply. 

I did as you suggested and sadly there was no change. 

I also did a clean reboot (I read that might help) and there was no change

BulldogXX,

thank you for the explanation. However the thing is I am not seeing a message that the program is from an unknown publisher. I believe that is the problem I am facing. 

Zackary,

I was able to run both commands successfully. Sadly there was no change in the results.