1.09 is a beta patch for which we don't have the reference data. So, no mods will be updated to it. It's unlikely that we'll get the final reference data until shortly prior to the final 1.1 release.

You can always run a double install so you can play 1.05 modded and the 1.09 beta. Just re-install 1.05, copy the entire folder to another location, then patch to 1.09. The 1.05 copy won't be tied to Impulse but should still run fine, and you'll be able to patch the main install with Impulse when more beta patches/final are released.

In Impulse, uncheck "show pre-release versions" in the blue orb menu, right click on Sins and uninstall. Now when you download the game again, it will download 1.05 Then you can do the trick I mentioned above to get both