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Explanation: If a license of a plugin is valid or not is not determined by the plugin itself, but by JIRA. In case of the bug, Atlassian's Universal Plugin Manager (UPM) returns an invalid license to ictime, and so ictime stops working. Reason why the UPM returns the invalid license is that on installation or update of ictime, the UPM did/does not store the build/release date of the plugin correctly, and this date is essential once your maintenance expires (for JIRA UPM to check if the version you have installed is valid in terms of having been released still within your maintenance period). As a result of the bug, after maintenance expiration, the UPM will always return that your license does not match the ictime version because the UPM thinks that this ictime version has been released after maintenance expiry, which is not the case.
There is no way to resolve this problem with reasonable effort from our side, as the suggested solution from Atlassian is not feasible in the specific case of ictime due to dependencies to another plugin (icbiz). Atlassian did not yet apply should have applied a fix to any JIRA version (status 23.02.2015; JIRA 6.3.x), but JIRA version 6.4 should fix the bugversio 6.4 (released 17.03.2015). You would need to update to JIRA 6.4, and after this uninstall and re-install ictime (the last version still released within your maintenance period). After this, everything should work like expected again. If you can't update to JIRA 6.4, please contact our support to find an alternative solution.