Since this is a physical paper model kit from the 1990s, "RAR" files found online are often scans shared by hobbyists. Check these sources:

If you are planning to build it from a digital scan, keep these details in mind: 1:33 (Standard for large Polish paper models).

specifically for "Fly Model 071 PDF" as it is a more common format than RAR. If you'd like, I can help you: Find physical copies currently for sale.