Steps to reproduce:
1. create custom module v 1.0.0 using http://christoctemplate.codeplex.com/ template, Create a package. Install module on separate DNN install.
2. update module version to v 1.1.0 (incremeent dll version as well), create a package, install newer version on top of existing version. (I made sure that new dll is in the package)
Expected: old dll in the dnn bin is overwritten with new dll
Actual result: old dll in the dnn bin is still there, thus upgraid failed