A license key is valid for the major version current at the time of purchase, and for all earlier and later minor and patch releases of that version. For example, if you purchased a license and the current version is 1.3.0, the license is valid for all 1.x.y versions (1.3.1, 1.3.2, 1.4.0, 1.4.5, etc.), but not for any new major versions (e.g., 2.0.0).
To upgrade to a new minor or patch release version, that is, a new version whose main version number is unchanged (e.g., 1.3.0 to 1.3.1 or 1.4.0 to 1.4.2), first Uninstall the installed version, then Download the new version, and then Install the new version. When doing this kind of upgrade, your existing license key will continue to work without needing to be reregistered.
To upgrade to a new major release version, that is, a new version whose main version number has changed (e.g., 1.3.4 to 2.0.0), you will need to go through the same process as described above, i.e., Uninstall the old version, and Download and Install the new version. Note that the old license key will not work with the new major version, so when you first use the new version, XindeX will operate in Free Trial Mode and be limited to about 600 entries. When you are ready to buy a new license key for the new major version, click Help→Register to pop up the the Register Dialog, and then buy and register a new license key.
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