public Subsystem <Unit> CopySetting(string target) =>
from _1 in mainValidation.CheckDirectoryExist(new DirectoryInfo(target))
let targetPath = @$ "{target}\UpgradeSetting.json"
from _2 in mainValidation.CheckFileNotExist(new FileInfo(targetPath))
let _3 = fun <string, string>(fs.CopyEmbeddedFile)("FilesUpgrade.Resource.UpgradeSetting.json", targetPath)
select unit;
