I have put the entire addon in exclusion and run the updater but the icon does not appear on my desk top
In your previous report, you said:
"The coutal icon has reappeared on my desk top, but does not have the dragon in it and states that it is still corrupted"
Now you are saying "the icon does not appear on my desk top", which is quite different. Please clarify.
.From all the comments of others it appears that the coutal engine has a deficiency
Nothing in any comment suggest the couatl engine has a "defincency", because if read them all, it would have been obvious it's always something else causing problem, in this case the antivirus.
What are the next steps
Will be defined by your clarification if the icon disappeared, or it's just missing the graphic, since they are completely different issue with completely different solutions.