Trackmania RPG Mapping: Most textures blank, how to change texture mod?

[Imbellis]

New to the forum, so sorry if this is in the wrong format or sub-thread.

I started working on an RPG map a couple years ago but took a break from it. After returning (presumably after updates), a majority of textures were blank as seen in the image below. I'm assuming this is due to the mismatch of mod files (RPG_DefaultMod_v2 against RPG_DefaultMod_v3).
Additionally, at first, I would get a "Could not load map!" Error when attempting to launch the map as if I'd downloaded it; however, somehow I fixed that.

I guess my question is how would I fix this? How do you update the pack that goes with a map? Thanks.

I couldn't embed the link, so here's the Imgur image address: LY5es3b