I have 2-1 bin, 2-2 bin, 2-4 bin, 2-5 bin, and 2 bin. However 2-3 bin is separated into 40 different chunks. When I try to install it, it can't open 2-3 bin since there is no 2-3 bin just 40 chunks of 2-3 bin. Any ideas?

I deleted chunk no.4 of bin 3 then removed witcher 2 from the list and put it on again. It redownloaded any missing files and managed to combine them into one 2-3 bin. Thanks, problem is solved now.