This is my first time downloading for GOG and I just cant seem to make it work. I purchased Tales From The Borderlands and I downloaded all 4 parts and put the in the same folder (can been seen in attached picture) but I'm not sure what I do from here. If I try to run one of the applications it just tells me that there are missing parts and that it cant install. So.. yeah, any help would be great thanks.

First impression is your game is not entirely downloaded and is only partially downloaded...

I'd recommend getting the GoG Downloader... It's a lot more reliable.

It seems like you downloaded some files two times. Delete the double ones and try to install the game again (double click the install exe of the game and after this install the patch).

As Jmich said in the other thread, the problem seems to be that the second .bin file, "setup_tales_from_the_borderlands_2.2.0.3-2 (1).bin" should just be called "setup_tales_from_the_borderlands_2.2.0.3-2.bin". The (1) part was probably added by your browser when it detected another file with the same basic name, but if the original names of the installer files are changed, the setup isn't able to recognise them.
Simply change the file name and it should work.

I've just done this and it make it actually started to install but the two thirds of he way through it stops and comes up with the message "installation failed with code: -3"

Your download is corrupted. Download the files again. Perhaps use the GOG Downloader if you have problems using your browser.
GOG Downloader: https://www.gog.com/downloader