Ensure you are logged into an account with administrator privileges.

Right-click the first ISO file and select Mount . Windows will assign it a virtual drive letter (e.g., D: or E:).

When the installer prompts for the second disc, unmount Disc 1 by right-clicking the virtual drive and selecting Eject . Then, Mount the Disc 2 ISO. Click "OK" in the installer to continue.

Follow the on-screen prompts. It is highly recommended to install FSX to a root directory (e.g., C:\FSX ) rather than the default Program Files (x86) to avoid permission-related issues with future add-ons or mods.

Open the virtual drive in File Explorer and double-click setup.exe . If the installer does not start, right-click setup.exe and select Run as Administrator .

You should have two ISO files, typically labeled "Disc 1" and "Disc 2".

Once the installation finishes, you will be prompted to enter your 25-character product key. Essential Post-Installation Steps System Requirements - Captain Sim