Download these from the Steam Workshop (via third-party tools) or the old SpaceEngine Forum archives.

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The technical jump in 0.990 increased the hardware demands compared to older versions: Minimum of 2 GB (4 GB or more recommended). At least 4 GB of available space. Operating System: Windows 7 or newer (64-bit required for current builds). Recent Post-0.990 Updates

Since the 0.990 launch, the developers have continued to release significant "upd" patches under the 0.990 and 0.991 versioning: SpaceEngine - The Universe Simulator

Look for a filename containing 0_990_39 or 0_990_40 . This is the final "upd" (update) before the Steam migration.