I downloaded premiere and Encore both as trials. Then towward the end of the month I purchased the creative cloud. Premiere works fine, but something with encore doesn't seem to have stuck. When I try to launch it, I get the error "encore cs6 cannot run in trial mode. plese relaunch the application and enter a serial number."
of course, there is no place to enter a serial number, and I don't even have one, because I'm using the cloud.
how can I solve this without uninstalling premiere?
First of all make sure that after you have purchased the Creative Cloud , you have activated your PPro with the your Adobe id with which you made the purchase.
To activate Ppro, on launching PPro it will give a screen to licence your product.You will have to sign in with your CC adobe id in order to activate it.
To check that PPro is activated- launch Ppro -> goto help -> in the Drop down menu if you see that the Deactivated button is enabled it means that your product is activated.
Once Ppro is activated. Encore will launch without any issues.
Let us know where you are stuck.