Oh! Are you saying that it would be unwise to install CSE at all because Comodo have discontinued it and withdrawn support for it

If so, what a pity as I had only just discovered it!

But what about the Digital Signature I have just installed? Will that continue to work or would I be best advised to uninstall it now, in case it causes problems in the future?
The cert will continue to work until it's expiry date, unless Comodo revokes them in bulk, which I think unlikely. After that you can get a cert from someone else, I think, though there have been circmsnaces in the past when C. has had to revoke certs before renewing them - not the same thing, but it means I cannot be absolutely sure. I've requested clarification on whether the free certs services has been withdrawn with CSE. No feedback yet.
I'm sorta hoping there will be a reprieve as CSE is not at all like the other withdrawn progs. It does its job simply and really well and works with modern clients just fine so far as I can see.
Best wishes
Mouse