Hello Gossamyr

One of the advantages of Blender is that you can have multiple versions of it on a system I have found that the easiest way to accomplish this is just downloading the zip files instead of the folders and running Blender from right inside its folder it does not have to actually be installed. I run Blender 2.49b, 2.65 and 2.72b mainly because when following some tutorials which are done in different version of Blender they are at times easier to follow if you have the version it was done in. Plus there is always rare occasion that you might come across a bug that cuases things to just not work right like happened recently with version 2.72 but most of those have been resolves in 2.72b. As to question about challenges that is something I will look into if I get feed back that our forum group wishes something like that to be started then I will look into what I need to do to get some challenges started. 

Lobo3433

Blender Maya & 3D Forum Moderator 

Renderosity Store

My Free Stuff

Facebook

Twitter

Renderosity Blender 3D Facebook Page