Switch Army Knife is a free tool which can easily convert Switch Roms from NSZ to NSP, and XCZ files to XCI. Download here for free...
I tested using that image link, and got the same behaviour, it fails for me on Desktop and works on the web! Desktop Result Based on the screenshots @rkhoo seems to be on Windows though!? I’ll probably re-install the Postman app and see if that makes any difference!next...