Where are you downloading from ?
Are you using a download manager ?
I don't know what you mean that this has been going on for a long time ?
Yes over the years there will be people who experience a problem, but they are most certainly in the minority or the forums would be full of it, I have been on the forums for almost 4 years and I don't see this.
Are you trying,to download and install in one go, rather than save to HDD and install off-line ?