That's an extremely outdated version. In fact if that is Original Sins of a Solar Empire I do not think that there are many mods for it, as mod support was not released until patch 1.05. I highly recommend that you update.
Well, i have a very old mod who add mines and torpedo who can be shoot by ship but 1.02 is too much new... it was a mod for the beta of the original sins, before public release... in fact, it was the first mod ever made for this game...
The answer to your question may lie with harpo's mod updater.
I don't think that it work in reverse... and if it do, it will not work with so old version... i think that it was around the 1.11 version that Stardock have switch the cl alpha with the da red... for downgrade a today mod to 1.02, you will need edit/modify .entity files but remake all the cl and da .dds map too...
By the way, if the guy have a legit version of sins, it is not a problem for update the game by register it and using Impulse...