Do not risk your Windows installation for a 15-year-old game.
The package includes:
Check the front cover, back cover, or the very last page. serial number metal slug complete pc new
If you're still having trouble getting your specific version to run, I can help you troubleshoot further. To give you the best advice, let me know: Do not risk your Windows installation for a 15-year-old game
A “new” Metal Slug Complete PC sold on eBay or Amazon marketplace is almost certainly one of two things: just the emulator and ROMs.
If you still want a single offline launcher with all mainline games (1–6 + XX), the community recommends – completely legal only if you own the original arcade PCBs or digital licenses. No serial number required; just the emulator and ROMs.