The official Echelon site offers a patch for the futuristic combat flyer by Madia and Buka (thanks VoodooExtreme). The patch comes as a 1.0 MB download that "corrects an error in the Instant Action missions and also allows installation on Pentium 1 or K6 machines." Update: If you're having difficulty applying the patch despite the extensive readme.txt file that is included, then Echelon HQ has some installation tips.