Since this is a physical paper model kit from the 1990s, "RAR" files found online are often scans shared by hobbyists. Check these sources:
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. Download Fly Model 071 Avro Vulcan rar
Look for from other hobbyists to see how it comes together. Since this is a physical paper model kit
Look for "Ecardmodels" or "Paper-Model-Library" for legitimate digital reprints. Download Fly Model 071 Avro Vulcan rar