Hi,
Thank you for posting the query in Microsoft community!
I understand that you cannot install the app need for the Acer c120 projector on Windows 8.
To resolve the "This app can't run on your pc" error, you may try the suggestions from the link:
- Is the issue confined to an app?
- Which anti-virus software is installed on the computer?
- Did you make any changes on the computer prior to the issue?
To know more about the error you may refer to the link.
Why can't I find or install an app from the Windows Store?
http://windows.microsoft.com/en-IN/windows-8/why-find-install-app-windows-store
Refer to the link:
Windows RT: Frequently asked questions
http://windows.microsoft.com/en-IN/windows/windows-rt-faq
If the issue persists, please do not hesitate to let us know. It is our pleasure to be of assistance.