I honestly don't know what's going on. Some people tell me they can't log in, others say they can, and I even tried logging in with another account and was able to.
A guy was having the same problem in another thread, but he managed to solve it. This is the message he sent: "
After redownloading the Mega app and using a VPN in Canada, I managed to download the files. My guess is that some countries just can't view the files without VPNs."