You can download the free utility and recover corrupt ODF files all by yourself. Although, the free version restricts you to view original data by displaying the “demo” and “demo restriction” words in place of original files. The free version also has the limitation of displaying only three images out of many images recovered from ODF files. In order to have the self-sufficient software without any restrictions, you need to purchase the final version of Kernel for Math Recovery which is unbounded by any condition or restrictions.
Please check the system requirements and supported versions before downloading the trial version.