Nothing has changed with them and both appear to download and install fine.  I would suggest e-mailing support@stardock.com, sounds like something else may be wrong.

I've gone and tested on a seperate computer, Windows XP as opposed to my Windows 7 computer, the 6mb file.  It also said the file is corrupt.

What was the error message specifcally?

Not able to reproduce this here in the office or at home.  Are you able to download a copy to a flash drive or other storage device from another location?

Within the same building, the file still was corrupt on receiving.  At home, the file works, installs, updates, and installs game programs just fine.  Both networks use the same ISP.  The first building however has a firewall.  I had gone around it on hardwire, still unable to get a working file.  There is an additional firewall possibly at the ISP device.

With the file from home installed on this pc, it installs and updates, but game files still come through corrupt.

If you can't download the Impulse installer without issue, I doubt downloading a game would be much better.  I would suggest checking for issues with networking or gateway security devices that may be causing this.  Do you have an IT department you could work with to resolve this?