Please note that you can only upgrade from Adobe Reader to Adobe Pro/Standard if you have already have a license for Pro/Standard
1. Open Adobe Acrobat on your desktop and you should see on the top left Welcome to Adobe Reader
2. Sign in with your Adobe credentials
3. Once signed in, click on the 3 lines in the top left corner and click on Help
4. Click install premium features
5. In the top right corner, you will then see the new files downloading to upgrade reader
6. Once complete you will be prompted to restart your device.