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Getting Started: Install OpenMW 0.49 (or Development Build)
To install OpenMW 0.49, visit OpenMW's GitHub Releases and choose either the latest latest release candidate build (0.49) for your operating system.
Make sure not to accidentally get the flatpak! Friends don't let friends use flatpaks, and MOMW's tools explicitly do not support flatpak distributions of OpenMW.
If you use Linux, you can also use the unofficial AppImage, which has versions for both release and development.
Should I Use A Dev Build?
To install a Dev Build with the latest features, look for a download link for your platform under the "Development Builds" heading on the official OpenMW downloads page.
Dev Builds are mentioned above as an install option, however you should prefer an actual release build unless you know you have a reason not to (such as: you need a new feature for some mod).
Dev Builds contain the latest features, as well as the latest bugs. Release builds are older but much more battle-tested, so you can expect fewer unknown problems.
Users of Dev Builds are always needed; this is how bugs are found and subsequently fixed. But unless you are OK with possible breakage and/or bug reporting, you will want to go with a stable build.
If you experience a bug in an Dev Build, please feel free to hop into the OpenMW discord server and let the team know about it, or file a bug on the project issue tracker.