I have download Keopatra but i don't know what should i do next...
Here is a small tutorial on how to verify signatures on windows: https://www.deepdotweb.com/jolly-rogers-security-guide-for-beginners/how-to-verify-your-downloaded-files-are-authentic/
Replace the mentioned signatures with the ones for electrum.
Current electrum installer (windows) :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=PtAe
-----END PGP SIGNATURE-----
Standalone executable: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=E/my
-----END PGP SIGNATURE-----
Both to be found on the official site: https://electrum.org/#download
Additinally from the official site: Sources and executables are signed by ThomasV (https://pgp.mit.edu/pks/lookup?op=vindex&search=0x2BD5824B7F9470E6)