To install an eSIM on your device*, you will need the received QR code.
Enter your smartphone settings and find "Cellular" or "Connections". Then choose "Add Cellular Plan" or "Add eSIM".
Then you will need another device to open the QR code on it and scan it on your smartphone. If you are unable to scan the QR code, you can enter your eSIM details manually. The necessary information for manual activation can be viewed by opening the details of the voucher.
You will then need to add a new cellular plan, rename it, and select HighPass eSIM as the default Mobile Data number.
More detailed step-by-step instructions can be found at the link.
*Please note that depending on the operating system of your smartphone, some steps may vary slightly. Also, not all Android smartphones support eSIM.