Hi
Download the latest package of OSProperty (2.7.3) and unzipp it.
Inside the folder "version.2.7.3 " you´ll find four folders (component - modules - other - plugins) inside the folder named "plugins" you´ll find the "plg_cronjobs_osproperty.zip"
Hope this help you
Stephen
If the problem can be solved why worry? If the problem can not be solved, worrying will do you no good.