How can I download specific dev version of Drupal module?
For the easiest way to do it:


Go into the repository 
Select a version there and click on it
There will be hash of commit (example)


So, you know the hash of commit - just clone this module from repository and switch to required hash of commit.

How to clone module via git

How to checkout the specific commit

Example:

git clone --branch 7.x-1.x https://git.drupal.org/project/geocoder.git
cd geocoder
git checkout c994066d58bc7518bc9796c60d4d43f98ae477cd