importing a .bas module to update a workbook using VB

I don't know where to start with this, but I would like to be able to send updates in the form of: "module.bas" to a user of my workbook and have it some way be automatically imported into the workbook without the user having to go into the VBE. Once it is in, I need it to run to update what ever changes have been made. There may be an easier way, but I am still a novice when it comes to programming. Any suggestions would be appreciated.

Thanks,

Rob