Legacy versions often require older redistributables that your PC might no longer have. Ensure you have DirectX 9.0c Visual C++ Redistributable 2015 installed. 3. Improving Performance Since 0.9.9.0 is unoptimized compared to the Steam version:

Always ensure you are downloading software from reputable sources. This article is for educational purposes regarding the troubleshooting of legacy software builds.

If you are attempting to run a legacy free version or troubleshooting the paid 0.990 version, consider these common community fixes:

If that fails, delete the cache folder entirely. Space Engine will rebuild it on next launch.