I feel really stupid for this reply , but here goes in case someone else has this issue. I have a 4 monitor set up and I only use the fourth monitor when playing racing titles so that monitor is usually off. Some how my downloads were showing up on that monitor when I clicked Download which has never happened before. I am sorry for any inconvenience I may have caused and feel like a real idiot at this point.

I am having the same issue for the past few days. I am on a home desktop and using the latest version of Firefox. I also have windows 10. I press the download button located here:

https://www.gta5-mods.com/vehicles/met-police-bmw-330d-area-car-els

and it takes me to the next page to download as shown here:

http://imgur.com/07imiJj

I click on click here and nothing happens. I have to use internet explorer for the download to work. I do also have ad block disabled on gta 5 mods.