i'm struggling to download a file using mega, it always shows decyprion error

i have tried searching for tutorial in youtube, however, there's a folder in the supposed tutorial that doesn't show on mine (the 'File System' folder)

can someone help me? i will really appreciate that

this is the link of file that i want to download

https://mega.nz/#!NNJ0WZQK!B62A5Uo6pGQqcWiiXXz1Nh9v8RgmxllDVV5LJSKuDLE