Loading VI

[Eternal Champion]

You can have multiple installs if you have room on your hard drive. I have non-VI, VI, and MedMod 1.85 all on the same computer.

[squidums]

I've found that old saved games are playable after installing VI, but some strange stuff happens.

for example:
I lost the ability to build Spearmen, though those already built were fine.
Trade routes didn't seem to be working properly.
Some off my buildings disappeared.
Some building could no longer be built.

So basically it's just not worth it. Unless you're looking for a random challenge.