Welcome @GoofyCoast33995! One place to check would be the Known Issues link at the top of the site. According to that link:
INSTALLATION
“Only 2 aircraft”
Installing the base sim using a different installation folder than the default folder will only download the mandatory content. To install the non-mandatory content, please do the following:Step 1: Go to Profile > Content Manager
Step 2: Select the content you want to see in the sim
Step 3: Download and install the content you selected
Step 3: Reboot your computer
Step 4: Launch Microsoft Flight Simulator
Hopefully this fixes your problem…