Here is an unsolicited tip on pulling these down while saving some angst. I had a problem grabbing these from the free account, even with the Free Rapid download tool. If you don’t mind giving Mega.NZ a minimal amount of your cash, this is what I ended up doing:

Created a free account on Mega
Upgraded to a Pro account. This is the tip part of this: because I didn’t really like any of the options for payment (I don’t have a virtual credit card, Paypal can no longer be used to purchase Mega subscriptions, etc.), I purchased an Itunes gift card and added it to my Apple account. Then using the Mega iOS app, I purchased a recurring Pro membership (for me it was about $10 US per month). You really only need this for one month.
After this, you can import the individual folders (from the text file) into your own Mega account. I couldn’t figure out how to do this until I figured out you DON’T initiate this from your own dashboard - you load each individual folder URL (one for each of the six disks) in a web browser. On THAT page there is an option to import into another Mega account. Click on that to initiate the transfer into your own account.
I still had a hard time using the Rapid download manager against my own account - it would still give me unrecoverable errors after about ten or so files and I would have to manually kickstart them to get them going again.
Instead, I installed the official Mega Sync tool and synchronized each of the six folders to a folder on my hard drive. I got good through-put this way with no stalling problems.
Once you get all of the RAR files, run them through an MD5 checker and then follow the rest of the steps for converting to ISO and burning.
Don’t forget to cancel your Mega subscription. I’m sure I will forget.