Is visualizer a free or native extension?
If it isn’t, any similar tool or extension for rendering?
Visualizer is free, It’s last officially supported SketcUp version was 2015, it can be made to work on 16 as well with a small work around. There are other free rendering options available, search render or renderer here on the forum, although few as simple to use as Visualizer was.
Thank you very much. I’ve got 2020 trial version. Is avalaiable? Can be installed in? (sorry my low level of English)
No, it is not available for 2020. Only for 2015 or earlier.
The simplest comparable alternative I’ve found has been Twilight Render.