Will it crash if you try to edit a 50MP file? Probably. Will it look dated? Yes—it still uses the Windows XP folder icons. Picasa 3.9.138.150 for Windows
Technically, yes. It hasn't been updated in nearly a decade. Do not use the "Web Album" sync feature (those servers are long gone anyway). However, if you air-gap it or just use it as a local viewer, the risk is negligible.
No other photo viewer lets you scroll through a folder of 500 raw images instantly. Picasa caches thumbnails aggressively. It is the only software that doesn't make you wait for a loading spinner.
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Disclaimer: Use legacy software at your own risk. Always scan downloaded executables with Windows Defender before running.