This is why I like lua mods.
Edit: a good av tool is actually process explorer because it can check all your running processes for viruses on virustotal. The reason this is good is because if you run gta and check your processes you can see if something is only running while gta is open.
If you mean the "Grappling Hook" mod, here it is: https://pixeldrain.com/u/3N8Gj2fU
I downloaded it waaay back in May 2015, so expect it to be an outdated version.
Do not use Internet explorer. It's horrid. Try this:
https://www.google.com/chrome/browser/
or this:
https://www.google.com/search?q=firefox+download&ie=utf-8&oe=utf-8
Create a folder on your desk top and name it something like fresh downloads. Then in your browser options have it save all downloads to that folder.