Cc/LrC startup problems today

I would suggest that you consider using the Adobe Creative Cloud Cleaner procedures.

https://helpx.adobe.com/creative-cloud/kb/cc-cleaner-tool-installation-problems.html

Ok, LrC, so a possible cause/solution. I will make an assumption based on that. My assumption is LrC was working, but it was not properly closed last time. That it either crashed, or you forced it to close. As a result the lock file LrC creates at start did not get deleted. In theory, you should get an error message, but I have seen this to occur without noticing the error.

see:

https://helpx.adobe.com/lightroom-classic/kb/lightroom-error-catalog-cannot-be-opened-lrcat-lock.html

Should this be the case, Be very careful to delete the correct file as it is  similar to your catalog.

It sounds like a conflict between the pending LR and Windows updates. Try shutting down your Windows 10 system and restarting.

I'm not that sure as to how I obtain the versions when the programs will not start(?)

Bring up your copy of Adobe Creative Cloud Desktop App (ACCDA), mouse hover over Lightroom Classic, the installed version shoul appear.

For your OS version, see:

https://support.microsoft.com/en-us/windows/which-version-of-windows-operating-system-am-i-running-628bec99-476a-2c13-5296-9dd081cdd808

I running the most recent versions that come with the Creative Clout Photo subscription. 

Often meaningless. We need actual program names, actual program versions.

For all is known, you could be talking Lightroom Desktop

For all we know, your Adobe Creative Cloud Desktop App is having update issues, you might have Lightroom Classic 8.2 

extra tip

I tried Ps, which started ok. 

Not applicable, PS  LrC are very very different. Might as well state notepad works while MS Word does not.

I see you are new to the community. Included below is a nice how to guide for the community:

https://community.adobe.com/t5/using-the-community/community-how-to-guide-tips-amp-best-practices/m-p/11601738#M47075

One important tip is to include pertinent information for more timely and effective answers:

Supply pertinent information for more timely and effective answers
The more information you supply about your issue, the better equipped other community members will be to answer. If you're unsure on how to do this, you can copy and paste this template:
 
*************
Explanation of the issue including what you were doing when the problem occurred, what you were trying to achieve, and any other information you may think is useful.
Adobe product and version number 
Operating system and version number 
Error message(s) (if applicable)
Computer hardware, such as CPU; GPU; the amount of RAM; etc. 
Screenshots of the problem (if applicable)
*************

In this case, Program name and version, complete OS name and version at the very least.

for exmple:

Lightroom Classic, v10.3

Windows 10 version 19043 (actually that is the build, but LrC calls it version, good enough)

You are referring to CC, you also referred to an installer. This makes me think you are running the very old Lightroom Perpetual that ended life at v6.14.

Or, a also very old version of what is now called Lightroom Classic, probably just at the beginning of the subscription model.

Adobe stopped using CC in the Lightroom program names.

So, what exact version do you have?