IPKalix Vault for Windows

Read your protected documents with the strongest protection, and offline.

Open the downloaded file. If Windows shows "Windows protected your PC", click More info → Run anyway.
Click Install. No administrator rights are needed.
Enter your email and the activation key from your publisher (or ask for a code by email).

Windows 10 (version 2004) or newer. Protected files (.ipkv) open with a double-click after installing.