How to permanently delete files from trash?

I usually see TV series online. Every time I visit to the website, it automatically downloads a Mac_Installer file to my Downloads folder. I delete the file without opening it and secure empty the trash. When I visit the website again, the same file is downloaded to my Downloads folder, and the "previous deleted file" from the trash can reappears on it. How to solve this matter? My computer is a MacBook Pro and is running OS X Mavericks.
Thanks.

Try erasing free space using Disk Utility.
Erase free disk space
When you delete files in Mac OS X, your Mac deletes the information used to access the deleted files but doesn't physically remove them. Although the space used by the deleted files appears as free space, the deleted files remain on the disk until new files are written over them. As a result, these files can be recovered. Erasing free space does not delete any other files on your disk besides the ones that you already deleted.
After the drive is connected, launch the Disk Utility application in any of the following ways:
Type the first few letters of its name into Spotlight. Select it from the results.
Go Finder > Applications > Utilities > Disk Utility
Go Launchpad > Utilities > Disk Utility
Once you are in the Disk Utility app, select the disk or partition you would like to erase from the left.
Select the Erase tab.
Choose the Erase Free Space button.
Use the Slider to choose how many times you would like to write over the free space.
Select Erase Free Space.
Note: After this process starts, you can cancel it at any time without harming any of your data. You might see a message stating that you are running out of disk space. This is normal and to be expected. You can ignore this message.
When the process is complete, you should have the same amount of free space. If you do not have the same amount of free space, try restarting the computer.
I hope I helped.
Austin

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