Hi i am testing LTR 7 beta but when i try to import to LightRoom 7.4.1 the interface ( Lightroom interface) is totally different from the one shown in your tutorial ( from about three years ago) is there any new tutorial about importing LTR files in Lightroom latest version? Thanks . Best regards

There are current tutorials on https://lrtimelapse.com/tutorial/ from this year.
But you need to use Lightroom Classic from Adobe (not the Lightroom Desktop / CC).