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When you download from the premium download button you just get a txt file called RockRobin_PremiumCode.txt.  When you read that file you'll find a code.  Make sure the game is updated (the game file is separate to the premium code file btw) and when in the game press the F1 key and the cheat menu will pop up. This is where you enter the code from the txt file.

Found it! Thanks so much for the fast help! :)