The following review written by one of the Software Informer contributors applies to version 3.3
Mega Manager is an application that allows users to work with Megaupload service provider and accelerate file downloads. You do not need to buy premium membership and even register to use it.
After installing the program you will be able to upload files at a reasonable speed without even opening a browser. Also, using Mega Manager, you will be able to resume interrupted downloads and perform automated batch uploads. Using this application you can check the availability of files on the download link without starting the download. Mega Manager has a built-in file manager that helps you organize the uploading and downloading of files.
It should be noted that Mega Manager works not only with Megaupload.com service. You can also use other services (e.g. Megavideo.com) from just this one application. To increase the download speed, you should buy a Premium account. Also, after getting the Premium account you will be able to download an unlimited number of files and place them in the download list.
Mega Manager is absolutely free.