1. Log In: Access the Astrill VPN app on your device.

2. Update Section: Go to the app store and look for an update or new version section. If available, download the latest version, such as "Astrill VPN 8.5."

3. Download and Install: After downloading, open the update file and install it on your computer.

4. Test the VPN: Connect to the internet and switch to the VPN menu to test browsing and accessing sites.

5. Check for Issues: Use the console for error messages and warnings. If issues arise, contact support through the app store.

6. Use Support: If problems persist, visit the app store's support section for help or assistance.

7. Stay Updated: Regularly check the app store for updates and consider checking the company's support resources for further assistance.

By following these steps, you should be able to update and use the latest version of Astrill VPN effectively.