Effective from the beginning of May, 2017 Tresorit will stop releasing updates to Tresorit apps that run on Windows XP and Windows Vista, or Mac OS X 10.7, and 10.8. since these platforms are no longer actively supported by Microsoft and Apple.
Please note that if you continue using Windows XP or Vista or Mac OS 10.7 and 10.8 after the support has ended, you will not be able to log into Tresorit or receive updates. Your computer will still work, and all locally synced data will be available.
You will be able to access your Tresorit account from other platforms and via the Web Access.
Please visit this article to learn more about which platforms are supported by Tresorit.