Cannot begin installation process, Calamares will not launch

[Wollie]

Welcome here, @tempo

@tempo

I downloaded the latest Manjaro KDE and copied the iso to a USB drive using Rufus on Windows.

Better use Etcher or Ventoy. Also check the checksums.

Make sure Fast startup is switched-off in Windoze.

I would recommend to follow this guide for dual boot:

[root tip] [How To] Dual boot Manjaro and Windows

Difficulty: ★★☆☆☆ Dual boot - Step by Step Target systems Firmware Checklist Windows preparation Manjaro installation Revisions Target systems UEFI Computers with preinstalled Windows (Windows 10) is computers using UEFI firmware. This guide is a generic guide targeted at UEFI installations. However some of the guide does apply even if you are using a BIOS/MBR setup. If you are using a BIOS/MBR (DOS) partition schema watch out for this Skip if using BIOS/MBR To ensure a …