The problem is that there have been so many added features to the modding aspects since Gold has come out that removing all traces of them is rather difficult to make it pre-Gold compatible. Just get Gold.
But you still need the 1.49 pre-Gold SE4 patch to run the TDM-Modpack, which has a Version that will run on pre-Gold. There are some other mods that run under pre-Gold as well, and you can find some of them in that Downloads database on SE.net mentioned previously.