i downloaded sketch book express and figured i could upgrade for pro so there was an upgrade that was 30$ or buy the whole thing for 60$ i thought since i already had exress i could just upgrade so i bought the upgrade and downloaded and when i try to install the program it wont let me save the file of *free trial* anywhere to continue with the installation. i also havnt recieved my serial number and have accidently exited out of the tab with the download link attachment and cant figure out how to get it back someone please help