I think running files on a shared / widely available drive is probably not the best idea. How many people are we talking about?
Since you have only 7-8 people in your group, perhaps the best solution here is to simply make the installation executable available on your shared drive, so your users can access the latest version of your tool whenever they want and can install it on their car in your free time.
I am sure that there are more elegant solutions here, but for such a small group it may take too much trouble, especially if you are not paid to distribute this tool to your peers.
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