|Did you look at the link? Says it is free. Easeus is moving toward trialware but cnet may have an older version.|
Testdisk is not that hard to use. You just need to read the help files first. If you had only ONE partition using all the available disk space then it should be relatively simple.
You could also use a live version of Linux that runs off of a CDR or flash drive. Linux can see the files even if the file system is corrupted.
Recuva probably won't work on the external drive.