I currently have Windows 11 IoT Enterprise lTSC installed and want to downgrade to 23h2, Pro or Enterprise, i want to do an inplace downgrade without losing any data.
While it is possible to do a downgrade it's not recommended nor supported by MS. Unfortunately, the only solution is to back up your data and clean install Pro v23H2.
It can't be done from 2024 LTSC to 23H2 with keeping all files and settings and such. Enterprise 2024 LTSC > enterprise 24H2 could be possible but not down a notch.