Using the latest version of Unity 2020.3 actually did help. I could at least start a scene... Interactions didn't really work but that might have been due to the missing Houdini connection. I'll try the Web version instead, now that there is one.
The GameDev.tv Game Jam 2022 - Free Course For All Submissions! » Entries » The time gate (La puerta del tiempo)
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Yes Hecker, the Houdini plugin is needed to work with the first version of the ramp in the last Road to travel gate scenario, but I join the models obtaining one Houdini Model with a meshcombiner, the Houdini plugin in this is not necesary. I think. Thank you for all of your suppert in this jam, for me was great.