Invalid or Corrupted file, HELP PLEASE!!! :(?

I finished downloading the game called " X-Note " when i double clicked it it said that " The Compressed (zipped) Folder is invalid or corrupted. My friend said that i should try using Stellar Phoenix Zip Recovery v2.0 and then i downloaded it, but it is a DEMO VERSION so i cannot repair it, i need to buy the full version so i can get the activation code... I don't have money :( So if everyone has an idea, please help me I really want to play this for a long time, best answers will really be given 5 Stars :(