If you're having trouble downloading an app because you've received an error message saying you have an incompatibility issue, you should be able to fix the problem by downloading an app called LCD Density.
Go to the Market/Play Store and search for LCD Density. Find the app called LCDDensity for Root and download and install it. It should be free. After it has installed, open the app and after reading the message, press "Continue."
A "Superuser Request" window will pop up. Click "Allow" to grant the request.
From this window, choose "Set density to 160." This is optimal.
While in this window, also select the drop-down menu for "Reboot method" and choose "killall."
Now click the "Apply (Restart)" button.
After your device has restarted, click on the menu button at the bottom of the screen.
Choose "Settings, "Applications" and then "Manage applications." Find the Market/Play Store and tap it. In this window, choose "Clear data."
Now you can go to your Market/Play Store from your home screen or App Drawer. You will be asked to accept the license agreement. This is how you will know you have cleared the data correctly. Now try again to download the app you had trouble with.