While upgrading wallet software it's advisable to verify what you've downloaded. It could be that someone interfered and you downloaded an altered version, that steals your funds.

nostr:npub1hea99yd4xt5tjx8jmjvpfz2g5v7nurdqw7ydwst0ww6vw520prnq6fg9v2 made this process incredibly easy in Sparrow wallet. 👍⚡️