You've been using Final Exhibits just fine, but the application suddenly won't open? You double-click the icon and nothing happens?? Or it opens but you can't drag and drop a sticker???
Chances are that you have an anti-virus software that is blocking Final Exhibits from running, after a recent update.
The solution is to tell your anti-virus software that Final Exhibits is known software and add it to its list of safe software. The list of safe software are sometimes referred to as a "Whitelist," "Allowlist," "Exceptions," or "Exclusions."
The details of how to do this are different for all anti-virus software, but e.g. with Norton anti-virus: