Assets folder is blank; think I FUBARed installation

PLEASE help! Really screwed up my Nesmaker installation. All Graphics Assets (in NESmaker 4.x.x/GraphicsAssets folder) are blank, and nothing I do seems to restore them. I think I need to redownload/reinstall the program, but I don't know how (without paying for it a second time). My version is 4.5.6, and, as alluded, I already purchased an activation key. Thx for any help in advance.

If you've already activated on your PC a fresh download should install fine. As far as I know they send a link via email now but you can also get to the latest version here...

https://www.thenew8bitheroes.com/downloads

Also, the files are supposed to be blank at first, they're just placeholders in a way. They need to be there from the start for NesMaker to work.

If you mean you've done some graphics and lost them check they're not in a folder created in the one you're looking at with blanks.

It's totally normal, all the graphics files are blank, bu default.
The installation process is just uncompressing the zip file.
Now, you are ready to follow the tutorials : www.thenew8bitheroes.com/LEARN
to learn how to use it, how to make your first NES games.