Some advice on the following scenario please
If I copy a old module created from an older version of a Vassal, make some modifications and additions to the module, would this bring the module up to the current version of Vassal if i have the current Vassal engine installed?
With the proviso that any Predefined scenarios will not be updated with changes you make in the module. You will need to load each scenario, use Tools → Refresh, then save and reload each scenario into the module.
If you make major changes like changing multiple map layouts, deck and at-start stack positions, etc, you will need to recreate the scenarios from scratch.