Editing Files

[Ibn-Khaldun]

And the advantage vs heavily modding v1.0......?

There are some things you can't mod yourself like the battle AI and campaign AI.
And those patches are available everywhere.

[Omanes Alexandrapolites]

Moved to Modding Questions (a week too late - sorry)

You can find the 1.2 patch here and the 1.5 patch here. You need to install 1.2 or 1.3 before you install 1.5. It's probably better advised to go with the 1.2 patch for the upgrade - it's smaller, so faster to download, and has less reported problems with it than 1.3.

As said, a lot of changes made to the game in patches are hardcoded and cannot be changed by modding. In addition, later version also do have a slightly higher level of modability if I remember rightly. Also upgrading will allow you to share your modifications with more people if you wish to at a later date.

[Squid]

I was always under the impression that 1.5 required 1.3 before being able to be installed, probably because they are both side-by-side upgrades with 1.4 and 1.6 versions of BI.