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A 64-bit operating system is required and a minimum of about 4GB of RAM are needed to process most songs, more for songs longer than 3 minutes. Virtual machines and 32-bit systems are not supported.
The Windows installer will guide you through the installation process. If you encounter problems with the installer, you can also install from a .zip file. Some 3rd party Windows programs can cause AnthemScore to crash when you try to open a file. If this happens, try dragging and dropping the file you want to open onto the side panel instead of clicking the 'Open' icon.
Windows 8 users may get a message that msvcp140.dll is missing. If so, simply search for and download the missing .dll. Then install it or place it to the AnthemScore installation folder.
To install on OS X, download and click on the .dmg file and drag the app to the Applications folder. Then right click and choose "Open". Double clicking will not work, since the app comes from outside the Apple store.
To run on Linux you also need to install Qt and create link_to_qt in the AnthemScore directory. See the README for details.