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To not confuse things too much: The current version of the app is v160 - this version is available in the repository. When installing the Core Company package, you might get an older version, as the package itself is bundled with the system. If you have v159 installed, and your R3 server has access to the internet, you can update the v159 Organisations application to the latest one from the repository (Admin panel -> Applications).
If you have exported a different version (v160) than the version you installed (v159), you made changes to the application itself. As explained in our docs, unless you are fine with loosing upgrade support, you should not make changes to apps from other authors directly. You can build on other apps - in this case their version number would not change.