Okay so it looks like the mods all end in .apk _ Choice of Mods. So my tablet doesn't recognize them. I've tried a few different mods and they all have the same thing. If I try to rename them to just .apk or .zip, I get an error about parsing? I'm not sure what to do.
I am not sure what is cause of the issue you are experiencing. However, perhaps try using a different browser to download the file, such as Firefox. You may also try using a file manager. Yet, from very brief research, you're issue could be because of the browser.
I would recommend checking out a post, on StackOverflow, that could lead to some correlation. To avoid posting links, you may search up "Tablet can't download .apk file in some browsers".