What Tiberius just said - you can download the zipped files from the links in the Will of the Senate FAQ. When you extract them, you will get RTR Platinum separate from MedMod etc, so you can install it separately.
I'm really enjoying Goth's All Factions mod 2.4.1 for BI. It's an absolute joy. The combat - morale, kill speeds etc - is close to RTR Platinum and the unit skins are beautiful. Strategically, it plays like BI but with some tweaks to make the hordes more threatening etc. You can download it from:
http://www.g-unleashed.com/index.php?cat=34&pid=634&page=goth's_bi_mod
Patch your BI to 1.6 first though (apparently RTW Gold's BI is not fully patched).
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