Thanks for taking a look at this issue.

Using Windows 7 and Firefox browser.

I've purchased a bundle with both Blitzkreig Anthologies.
The first game installs fine, no issues.

But Blitzkreig 2 won't install.
Using the Gog downloader, I get an error message saying,
"Unable to fetch data, try again later." This has happened a dozen times now.

Using my browser, things get very weird very fast.

There are four segments to download.
The first segment brings up a dialog box with a little blue file card looking icon on it, saying you have chosen to open setup_blitzkrieg2_anthology_20012.exe which is binary file.

Once this downloads, if I click on it, I get a weird error message asking me to tell it where I put "section 3" or something like that.

The other three segments say that they aer "VLC media file (.bin)" and I have the option to save or to open.
When I save these,then try to install, it brings up an extremely ugly primitive program with an orange traffic cone, with little icons of traffic cones. Click on these icons, and nothing happens.

Are you using the most recent version of the downloader? It should be version 3.6.0.0
If not, download the current version and try it again.

I deleted the installed gog downloader, and installed the latest version.
Now I am getting the error message "not enough disk space"

I deleted four other games from the disk to make room....and I'm STILL getting this error message!

Found this page in the support section... If freeing up more space doesn't work... I don't have any other ideas :-\

To install the game, you have to download (save, not open) all of the following files into the same folder:
setup_blitzkrieg2_anthology_2.0.0.12.exe
setup_blitzkrieg2_anthology_2.0.0.12-1.bin
setup_blitzkrieg2_anthology_2.0.0.12-2.bin
setup_blitzkrieg2_anthology_2.0.0.12-3.bin

Once finished downloading, run setup_blitzkrieg2_anthology_2.0.0.12.exe to start the installation. If one of the bin files is missing or renamed there'll be a message that this file can't be found and the installation will abort.

If you don't want to download the files with your browser, but use the GOG downloader instead, you'll need more space during installation. The downloader gets the files in junks puts them together and checks file integrity. All this is done by using additional space (up to the double of all installer files) usually on C:, no matter where you install the game. So if you freed some space elsewhere, e.g. on D: because you want to install it there, it doesn't help. The temporary files will be stored elsewhere. If space is a problem, download the files manually via your browser like described above.