A user is unable to use the latest version of an application on a legacy...

The most likely reason a legacy tablet cannot run the latest version of an app is that the tablet’s operating system is end-of-life (EOL) or otherwise too old to meet the app’s supported OS/version requirements. Quentin Docter explains that an OS life cycle ends when it is no longer supported, and that an OS at end-of-life will no longer receive updates (including feature updates), making it increasingly incompatible with modern software that expects newer OS frameworks and APIs. The All-in-One guide reinforces this by noting that apps may fail to launch or install when they are not compatible with the device’s OS version (or related vendor customizations).

While insufficient storage can also prevent an update, that typically produces an “update failed/not enough space” condition rather than a consistent inability to use the latest version due to platform support; Mike Meyers’ Lab Manual specifically calls out free space as a common cause of update failures. MDM restrictions and malware are possible but are less “most likely” for a personal legacy tablet.