those packages on codeplex named with "deploymentfiles" are not source code, the only correct way to get the source code is using Tortoise HG, if you use the real source code you will not see an option for pre-compile because it is not a valid option for the web application project type that we use.
also do not try to download source code from the source code tab on codeplex, it is not reliable, use Tortoise HG