i have tried redeeming the product code and everything and it asked me to download and i pressed the download button and it downloaded 'arvato' and after that it when i did that it showed me a message saying 'download_package cant be opened because the identity of the developer cannot be confirmed.' this is so frustrating because i need to start using this software that i paid a lot to purchase
Are you using a Mac? Gatekeeper may be blocking.
I think App Store only is the default setting for Gatekeeper but you can change prefs to allow download from anywhere.
Gatekeeper options are found in Apple menu >> System Preferences… >> Security & Privacy >> General tab under the header "Allow applications downloaded from:"