so as you've read from thge title, i downloaded adobe flash cs4 for a 30 day trial, and after only 3-4 hours, it expired. when i double click on it on my desktop it simply says licensing for this product has expired.
Was it downloaded before on the same computer?
Please repost in the Flash forum. This forum is for comments abbots the Adobe forums themselves.
Erase your hard drive reinstall your system and software
About sums it up. lol