I really loved MarkdownPad2 Pro and I used it extensively, but I have moved since to another solution. The MarkdownPad2 is no longer developed and I agree with others on this forum that it would be better if the option to pay for the Pro version was taken down from the site.
See, for instance this thread:
As an alternative I am very satisfied with the free(!) Microsoft's Visual Studio Code with the Markdown Preview enhanced plug-in. See for information here: https://shd101wyy.github.io/markdown-preview-enhanced/#/
Hope Evan does well in his new projects, Cheers!