Here is how to install.
http://www.codeweavers.com/compatibility/browse/name/?app_id=4901;forum=1;msg=62706
As for a free version of Crossover games. Give it a try for 30 days, if you like, then support them by buying it.
Seems like it has a few issues, and no need to do a manual install, just an express.
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Edit.
Here is how to install (hopefully)
First download the crack for R6V2.
1) Open up Crossover Games and click on Install Software and a New Window will appear.
2) Click on Install Unsupported Software... and Click Continue.
3) Click on New Bottle and Continue.
4) Make sure Choose Installer File is highlighted in bold and click Install.
5) A new window will appear. In this you will choose the R6V2 setup file, which should be called setup.exe. If not, then I'm sure you can just click on autorun.exe. (No idea on the name, i don't have the game.)
6) Install the game like on normal windows.
Right, the tricky part is finding the bottle and installing the crack to make it work.
Go into your Finder and make sure you're in your user directory.
Click on Library > Application Support > Crossover Games > Bottles > ( click on the name you designated for your bottle e.g. R6V2) > drive_c > Program Files > ubisoft (guessing from this point) > R6V2.
Once in that folder, hopefully you can find where to place the cracked file, and overwrite the original.
Right, as the site states, you need to open up R6VEGAS_GAME.EXE and not R6VEGAS_LAUNCHER.EXE.
Make sure you check out the Tips and Tricks section on making the game run better at.
http://www.codeweavers.com/compatibility/browse/name/?app_id=4901;tips=1