SimpleDocs is a proprietary software. The source code is not available to the public.
No support cycle dates have been set yet. You can contact us and ask your questions through the usual support channels (forum, support form, etc.)
This is a Windows security measure. If you downloaded SimpleDocs from our website you can ignore this warning and use the software with confidence.
Uninstall the previous version before installing the update.
Please report it in the forum or send us a support form explaining the problem.