I gave it a whirl as it seemed to be straightforward to use. My aim is getting Word 2019, Excel 2019 and Powerpoint 2019 installed for Windows 8.1 x64. I mounted ProPlus2019Retail.iso (german) to the virtual drive F:\ and ran both YAOCTRI_Configurator.cmd and YAOCTRI_Installer.cmd. That's what I got: Spoiler ============================================================= Source : "F:\" Version : 16.0.10730.20102 / Arch: x64 / Lang: de-DE Channel : Monthly CDN : 492350f6-3a01-4f97-b9c0-c7c6ddf67d60 SKUs : Excel2019Volume,PowerPoint2019Volume,Word2019Volume Excluded: OneDrive Updates : True / AcceptEULA : True / Display : True PinIcons: False / AppShutdown: True / Activate: False ============================================================= 1. Install Now 2. Exit ============================================================= Choose a menu option: 1 ============================================================= Preparing... ============================================================= ============================================================= Running installation... ============================================================= ============================================================= Installation failed. ============================================================= Press any key to exit. I assume YAOCTRI doesn't work for my Windows 8.1 x64 or I need to do an additional step prior to running it. (Microsoft Office 2010 had been on this machine before, however I removed it thoroughly.) Any suggestions? Thanks in advance.