v.4.399

ver4.399(2021/07/02)
Target framework is changed to .Net 5.0.
Added new EOSs (Fratanduono+ 2021).

.Net 5.0 components can be installed from the following link:
https://dotnet.microsoft.com/download/dotnet/thank-you/runtime-desktop-5.0.7-windows-x64-installer