or use a dynamic IP by restarting their router to reset the data limit tracked by MEGA. Is It Safe?

The search volume for MegaDownloader 1.7 is largely driven by one desire: escaping the MEGA transfer quota. Free MEGA accounts have a dynamic transfer limit (often cited around 5GB to 20GB depending on IP address), after which the user must wait several hours or pay for a subscription.

A: No. Version 1.7 was the final release. Any website offering "Megadownloader 1.8" or "1.9" is 100% a virus or a scam.