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If you insert the license for the pro version, you will get the pro version no matter what version you have installed.This is easier :Download and install the latest version > https://forum.avast.com/index.php?topic=187663.0Insert your license
Not possible.AIS and Pro are two different versions.The license is only valid for the version you bought it for.
If you really need/want to, you can strip down AIS to Avast Pro.-> https://www.avast.com/faq.php?article=AVKB96#artTitle