I registered Bandicam by downloading a simple torrent and cracking the software so it can be registered. You can use the link here to download the torrent if you're familiar with using them:
http://thepiratebay.sx/torrent/8401267/Bandicam_1.8.7.347_Final_Multilanguage_Incl_Keymaker_-_SceneDL
The file downloaded comes loaded with Bandicam and a special cracking software called KeyMaker. The one thing people get worried about when they download the file is their computers pick up a presence of spyware - there's none in this file, don't worry. It's more so your PC whining because it knows that software can crack Bandicam, more or less.
If you aren't familiar with torrents, do a quick Google search of torrent software such as Vuze and install that first. The rest is pretty self-explanatory by reading the README file included with the torrent you download.
Happy LP'ing!