See also installability
Upgrading is the process of replacing a product with a newer version of the same product. In computing and consumer electronics an upgrade is generally a replacement of hardware, software or firmware with a newer or better version, in order to bring the system up to date or to improve its characteristics.
Upgradeability refers to the ability of a software system or product to be easily and efficiently upgraded or updated to newer versions, typically without causing disruptions to existing functionality or requiring significant reconfiguration.
An upgradeable system allows for the seamless installation of patches, enhancements, or major version changes while maintaining its reliability, compatibility, and performance.
(these explanations were drafted by ChatGPT v 3.5)