MarkdownMe 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 MarkdownMe from our website you can ignore this warning and use the software with confidence.
Uninstall the previous version before installing the update.
This may be because the document has been saved with ANSI character encoding instead of UTF-8. Try saving the document again in that encoding.
You probably have internet connection problems or the images are no longer available.