Try this one, as it is still working right now:
http://download.progdvb.com/ProgDVB5.13Std.exe
In times of real big harddisks, don't throw away each and every thing after first use of a download.
And think about a suitable (multi stage) backup strategy, to be able to step back at any time.
For every stage, you need a proven working way for restoring.
Normally, you may just keep a full copy of the folder structure in another place, to preserve an old working version of ProgDVB.
Or install into folders with the version number in their names, to allow you having installed more than one version. Then, just don't register codecs each time again. And in most cases, you can even install over a full copy of the former one.
Usually, one should have system backups, based on MS Backup and / or partition images. First one would allow selective restoring, second one is fast and simple, but normally just allows a full step back to a given state.
For downloads, documents and alike, find yourself a suitable place (like Windows provides in the personal folders), and do not clean up to often, but move or better copy all things to somewhere else, move if seeming to get obsolete occasionally. Delete when being really sure, no sooner...
An external drive would be helpful for things like this. For all sort of relatively small files, a USB stick may be fine, for bigger ones, a USB HDD should normally do. Except of one limitation, as it may be not available in situations when Windows won't start anymore.
Well, I'm tending to go off topic now, so I will stop right here.
But data preservation is a really important issue these days, with quite a variety of aspects. And the internet tends to forget...
So always store possibly important things at your place.