Installing game on new PC

[FTBSS]

Trying to install game on a newly upgraded PC and when I try and install it says base game not detected

[michaelm75au]

Are trying to install the game or a DLC or the patch?

[FTBSS]

The main game soi I can do the patch and the dlc afterwards its the CMO main game from my game section of matrix website

[VPaulus]

Do you have the base game on Steam? If not then please do the following:

1. Please download the two zip files parts, "CMO-MultiSetup-v1.05.1307Part1.zip" and "CMO-MultiSetup-v1.05.1307Part2.zip", for installing the game from your account download area. (*)

2. Once you have finished downloading the two parts please unzip both files to the same folder in your hard drive.

After unzipping both files, you should have 8 extracted files in the folder:
"CMO-MultiSetup-v1.05.1307.exe"
"CMO-MultiSetup-v1.05.1307.2"
"CMO-MultiSetup-v1.05.1307.3"
"CMO-MultiSetup-v1.05.1307.4"
"CMO-MultiSetup-v1.05.1307.5"
"CMO-MultiSetup-v1.05.1307.6"
"CMO-MultiSetup-v1.05.1307.7"
"CMO-MultiSetup-v1.05.1307.8"

3. Run the one named "CMO-MultiSetup-v1.05.1307.exe".

4. When asked to insert the serial number, please click in the drop down menu "Select a New Product to Install... " and select "Command: Modern Operations".
Type your "Command: Modern Operations" serial number.

5. Click in the button "Check Serial".
You should see then the name"Command: Modern Operations" being added to the list of games displayed in the box named "Setup as detected a valid serial number for:".

6. Repeat steps 4 and 5 for each of your DLCs.

7. Click in the "Next" button in order to proceed with the installation of your game and DLCs.

(*) Please see the forum post below which explains how to do this:
https://www.matrixgames.com/forums/tm.asp?m=4675348