Resolved.
Windows Security was blocking part of the application “_typeconv.cp314-win_amd64.pyd” and, in addition, during the installation in KDEnlive it gave the error “Error while running python3 script: c:/portables/KDEnlive/bin/data/kdenlive/scripts/whisper/whisperqyery.py.”
The solution was to disable “Smart App Control”.
By the way, the screenshots in the manual are outdated, both in the installation of the plugins and in other sections.
Regards,
LaMola