PROBLEM SOLVED!
Thanks to Maverick1988 who suggesting a good path.
Here is how you can have your "GREEN DEVILS" campaign working perfectly with GOG's release. And without tempering with GOG's installation files as the unofficial Green Devils add-on is just an extra campaign stored into the "CUSTOM" folder. Sorry for my approximate English.
1- Install your Blitzkrieg Anthology game from GOG.
I always install my games in a custom folder, and the game is located in: "C:\Discover\Blitzkrieg I Anthology" (and not in the default folder "Program Files...\"
I do not like having games in "Program Files" folders as it creates sometimes added troubles according to your version of Windows (XP,Vista,7,8..) and 32 or 64 bytes. (I use W7-ultimate 64b on all my computers)
2- Once you have installed the anthology, just check if Blitzkrieg, rolling Thunder and Burning Horizons work.
3- Now, we will create a ".reg" for sending missing data into Windows' registry. When Green devils tries to unpack its compressed files, it will simply check if the original Blitzkrieg, BH or RT have been installed. As GOG has simplified the game and installation and customized it, it does NOT create a simple key that was formerly created by CDV. And Green Devils is looking for this "old" key as it does not know about GOG's version...
For this, simply do the 5 steps below:
a- open NOTEPAD and create a new text file (whatever name, by instance "GD.txt"
b- copy paste the text below, only the part in bold :
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\CDV Software Entertainment AG]
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\CDV Software Entertainment AG\Blitzkrieg Rolling Thunder]
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\CDV Software Entertainment AG\Blitzkrieg Rolling Thunder\English]
"target folder"="C:\\Discover\\Blitzkrieg I Anthology\\BH-RT"
"language"="English"
"version"="1.0"
As you can see, nothing strange, nothing that can harm your computer! 100% safe.
c- Change the path for reflecting your own installation path. (note that the registry path needs 2 \\ rather than 1 \ in normal path, it is C:\\...\\... and not C:\... \...)
You can see the key: "target folder"="C:\\Discover\\Blitzkrieg I Anthology\\BH-RT"
... put your own path, where is located the folder BH-RT for the Blitzkrieg Anthology.
By instance, it can be something like:
"target folder"="C:\\Program Files (x86)\\GOG Games\\Blitzkrieg I Anthology\\BH-RT"
... then close and SAVE the text file
d- change the extension of your text file fom "txt" to "reg". If it was "GD.txt", it should be now "GD.reg". And double click on it for sending the info to the registry. Once created, it will give you a confirmation message.
4- Done. In Windows, there is a key with CDV name, and linking GOG with the old path. Run your Green devil installation, and it will recognized your GOG's installation.
For playing Green Devil's campaign, go to Blitzkrieg (GOG's version), then (I quote the original readme file):
[i]To play "Green Devils" start the game by clicking the
"Green Devils" - shortcut on your desktop.
Go to the main menu and choose "New Game", now select
the menu point „Custom Game“.
You will see the following menu points:
„Custom Campaigns“, „Custom Chapters“ and „Custom Missions“.
You can play the campaign of the „9th Tank Division“
by choosing the menu point : „custom campaigns“.
You can play the „Airborne campaign - Eagles“ by choosing the
menu point „custom chapters“ and you can play the
„Tank School" by choosing the menu point
„custom missions“.
[/i]
Post edited July 30, 2013 by jappy