Click "Install" and allow the process to run. Windows may ask for confirmation to install the unsigned drivers. If a warning appears about driver signature verification (common in Windows 10 and 11), you may need to temporarily disable driver signature enforcement in Windows. You can do this by restarting your PC and using the "Disable Driver Signature Enforcement" option in the Advanced Startup menu. Once the drivers are installed successfully, restart your computer to finalize the process.
Here is why the pack is mandatory for current users: flashtool xperia driver pack v19 new