I originally downloaded and installed the game no problem, but after some befuddlement with mods before I figured out how they worked totally and hard edited some textures I decided to use the uninstaller and redownload it, but once I downloaded all the files the installer refuses to recognize the two BIN files are in the folder with it no matter which file I move them two, I always get "The file could not be found in the installers folder. Please make sure that the file is in the correct folder or specify its current location.

Hmn, maybe your browser has renamed the bin-files? firexfox sometimes does this when it thinks there already is a file with the given name. If the filename ends with single digit in parentheses like "(1)", this is what firefox added to the name.

But I have problems downloading Fallout NV, too:

I've downloaded the 3rd file (2nd of 3 .bin) multiple times, and it's always diffrent.

Filesize is near 4GB, but that's no prob for the download computer (not a fat32 filesystem prob or something).
Browser: Firefox 52.3.0 (64 Bit)

The installer integrity check always said the ever diffrent 2nd bin is invalid.

The first bin (also about 4GB) was fine from the the first try.

I'd use other downloaders like the cmd-line tool wget, but the gog servers disallow that.

Can't use the gog download tool, since the download computer isn't MS windows.

https://gog.com also doesn't seem to be prepared to be browsed using "lynx" browser.

I was now able to solve my download problem.
The files have been truncated versions of the original., even though FF did think the download was complete.

Using this trick of replacing a paused dummy-download's .part file with the content of one of the incomplete downloads, I managed to get the full file.

But now, after days of downloading, I found out that Fallout New Vegas isn't XP-compatible.

It complains about a missing Kernel32 function (I think it wa called "GetLocagicalProcessInfo()").

Fuck. Fallout 3 worked.

Strange as it DID support Windows XP at launch.

Linux + Wine to the rescue! https://www.gog.com/forum/general/the_judas_does_this_run_in_wine_thread_v1173/post1110

https://www.gog.com/forum/fallout_series/fallout_3_for_linux

Thank you. I've already seen that, but I wanna keep these gog things in a Oracle virtualBox with XP guest.

Have a little outdated hardware, too (AMD-E350 APU), so I already have to live with contraints about kernel versions and the like (the opensource radeon drivers work fine for everything except gaming).

Fallout 3 (in the winXP guest on a host kernel with amd drivers) worked as good as the hardware can do (low settings, live with some fps drops in special cases, ok, and live with video playback problems).

In case someone should want to also try that: On the guest, use regedit to create this key (the virtualBox guest Additions drivers use some code fragments from wine):
HKEY_CURRENT_USER\Software\Wine\Direct3D\VideoMemorySize (in MB, text-mode key).

Played it through for the first time, iirc with not a single crash (sometimes there were hangs on teleport-style entry into buildings, but thesse hangs were always solved by just pausing and unpausing the VM).

For New Vegas, I've tried to upgrade XP to SP3 in the meantime.

But still no luck, NV now complains about another missing Kernel32 function:

QueryFullProcessImageNameA()

OK, the finer details of OS kernels are above my grey hair. I dual boot my laptop (Win XP & L Mint) but it only has integrated Intel graphics from Anno Dazumal = ganz S*** so no 3D gaming on that one at all.