Well, if you don't have a disk there's not much you can do, since Impulse only carries the latest update. With a disk, you can install 1.0, patch to 1.05 (the latest standalone), make a copy of the folder, then update again with Impulse. Then you'll have 1.05 out of the copied folder and the fully updated one from the main install.

After the patches were made Impulse-only, you'll have to manually archive each version install so that you can install from that (like if you wanted 1.1 and not 1.16).

Yep! Again you can only do that up to 1.05, after that the updates started being Impulse only so from 1.05 you can only patch up to the latest 1.16, not anywhere in between. But any 1.1 mod should pretty much work for the entire patch series (1.10 > 1.16), I believe.