There is no legitimate, widely recognized official Apple tool named "Show Passwords" that requires a separate download . If you are looking for a file specifically named "Download Show Passwords dmg," be extremely cautious, as unauthorized third-party software claiming to reveal passwords can often be malicious.
Instead of downloading external files, use these official macOS features: Passwords - App Store - Apple
Apple Passwords is a useful app for managing my passwords and keeping them secure across my devices. Find saved passwords and passkeys on your Mac
Modern macOS versions (Monterey and newer) have built-in tools to view and manage your saved passwords securely without needing extra downloads. Built-in Methods to Show Passwords on Mac