Packed? Taking your Andor Zip as an example, I repacked using Peazip at max and I'm getting about 12% more compression. That might be just enough to get it under 100MB.
I've made surf tiles for Weytahn using PlSplit64, the res. was good for L7, upscaled once to make a set up to L8. With the right source image (like this) it's quite easy, just wish the Elev tiles were that easy too. But I still can't get Texpack to work, very frustrating! even tried it on another system.
So you'll need to run the tiles through Texpack to make a .Surf file.
Converting old tiles is a bit more complicated but is quite well detailed in the Orbiter docs- Orbiter2016/Docs/PlanetTextures.pdf Chapter 9, they basically just need resorting into the new file structure.
You can do clouds and lights with PlSplit64 as well (just not the Elev!). The files just need to be saved at the right size and then run through PlSplit64 as per instructions in the PlanetTextures.pdf. PlSplit64 just asks for the file name, long lat of the source file and output folder.
If you make a new folder, copy PlSplit64 and DxTex into it, add your source files and make another folder for the output, you have relative paths and only need to type the name in.
Attached Weytahn, not tested.
Note the Zip is 11.3 MB, unpacked it's nearly 90! (Peazip)