>Which software updates are free?_Campbellsci 数采常见问题

The blog article "How to Navigate the World of Software Upgrades, Patches, and Trials" explains the difference between patches (free of charge) and upgrades (for a fee). This example quickly shows the difference between an upgrade and a patch:

Upgrade Patch

Major version change, such as 1.3 to 2.0

>Which software updates are free?_Campbellsci 数采常见问题

Minor version change, such as 1.3 to 1.4

Typically requires purchase for a fee

Free of charge

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