You only need to download the base and then download and install the maintenance release you want to go to (ie. coming from 7.1.x you would download 8.0.0 and download + install 8.0.12, then reboot
However, it is recommended to download, install and reboot the base and then download, install and reboot the maintenance release
Here are the upgrade best practices: https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClRrCAK
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