Where can I find old official Manjaro ISOs?

[brahma]

check this first, maybe the ibt parameter will help:

Unable to get into KDE desktop from LiveUSB

secure boot disabled in bios; fast boot disabled in bios - you may not have this option; fast startup disabled in windows, if you are dual booting; AHCI enabled in bios, if you are on RAID, and you are dual booting, dont switch, otherwise you will not be able to boot into windows; use Ventoy to flash the iso; and boot with the ibt parameter: https://forum.manjaro.org/t/not-able-to-boot-manjaro-kde-from-live-image/135648/6