All of the mods I've looked at say I need to go into Dynamic Resources but i cant find where the files are

I haven't installed the GOG version yet, so I can't say for certain, but my Steam copy has a DynamicResources folder right in the Evil Genius folder. Depending on what version of GOG's installer you used, that's likely at either "C:\Program Files (x86)\Evil Genius\" (drop the "(x86)" if you're not using a 64-bit version of windows) or "C:\GOGcom\Evil Genius\".

If a DynamicResources folder doesn't exist in your Evil Genius folder, you can probably just create it and drop the files in (note that there's no space, it should be "DynamicResources").

I am also experiencing this issue, to add a little more detail I currently have no dynamic resources folder in my GoG directory for this game. All aspects of the game function perfectly, but I am unable to install any mods etc because this is where all those files would be stored. I have tried creating the folder myself (DynamicResources) but the mods do not function because they cannot affect the files that do not exist. Similarly, files that should exist such as the population.ini file do not exist for me to alter values on.

For me its computer>C drive>GOG games>Evil Genius

All the folders and files are listed there, Im using windows 7.
Keep me up to date on the mod Im very much interested=)

That's weird. You should have the following folders in the main Evil Genius directory:

DynamicResources
ReleaseExe
ResourcePAK

The only files in the main directory should be uninstaller files and possibly ReadMe files and URL files. I have the original CD version of this, but the GOG version shouldn't differ by all that much you'd think.

If you have any other files or directories, what are they? Are the only things in there links, or are there other folders and files?

it's possible that the main GOG folder only contains links to the game, while the actual folder containing all of the files is installed somewhere else. This is possible since the game originally stored its save games inside CodeGeneratedData and Layouts, which are both contained within DynamicResources. So it could actually have been installed into your user directory in order to circumvent the retarded UAC. This makes some sense (although it's not ideal IMO) since it's easier for an installer to stick all of DynamicResources directly somewhere else, rather than try to split out those other two directories for saved games. This will naturally cause issues if you have multiple users trying to play the same game on the same machine, but otherwise it won't appear to function any differently.

At any rate, this folder must exist in some form or other, as it contains a bunch of files that the game needs (many of which are moddable, such as population.ini - which is located under Config in DynamicResources). So it must exist somewhere in some form. So it has to exist - simply creating it somewhere won't do anything since it definitely must exist somewhere.

If you're having trouble finding it, do a search for "DynamicResources" across your entire hard drive using the search tool that comes with Windows. It might take a while, but you'll definitely find it that way.

You might also want to set your folders to display hidden and system files/folders, just in case it's hidden for some reason.