CVE details: https://www.cve.org/CVERecord?id=CVE-2025-30258
Download the latest GnuPG installer exe from here: https://gnupg.org/ftp/gcrypt/binary/ gnupg-w32-2.5.5_20250307.exe
Running the installer will delete the contents of C:\Program Files (x86)\GnuPG and will create C:\Program Files\GnuPG
This causes Kleopatra to complain with an error like
Kleopatra could not determine gnupghome