If you already have this specific file and are trying to use it:
[Steam] Spring Sale 2023 | Hidden Gems Thread : r/GameDealsMeta Squad.51.vs.the.Flying.Saucers.part1.rar
Files from forum posts often require a password, which is usually listed in the original post where you found the link. If you already have this specific file and
Downloading game archives from unverified sources carries risks of malware or unwanted mining payloads. you can find it on Steam
The game features 2-player local co-op but does not support online multiplayer. Typical "Part 1" File Info
The game is readily available for purchase on official storefronts. For the PC version, you can find it on Steam, where it often goes on sale.