Didn't work for me at first too.
Option 1 - Use joiplay. But if you want to use the botnet checkpoint system it won't work on joiplay (you can still use the mod to see the numbers but the checkpoint system doesn't work for some reason)
Option 2 - If you want to use botnet's checkpoint system and you don't mind playing online then -
You must be registered to see the links
. But you can't use the image package.
Option 3 - If you want to use botnet's checkpoint system and also the alternate image package then ---
a)Download this file manager -
You must be registered to see the links
b)And then download brave browser -
You must be registered to see the links
d)Then finally open the file manager app that you downloaded, find the download folder and then click on the html file, and when the option comes about what app to use to open the html file - select brave browser.