Failed to download the package from https%3A%2F%2Fgithub.com%2Ffsitok%2Fklayout-simplify%2Ftags%2F0.1.1.
There needs to be a file called 'grain.xml' below this URL. It needs to have the XML format of a KLayout package definition file.
This URL will be used for the package file: https%3A%2F%2Fgithub.com%2Ffsitok%2Fklayout-simplify%2Ftags%2F0.1.1/grain.xml.