Respawn not work

I am the only one who does not like the respawn issue, when giving it to care, nothing matters, and a few months ago it worked. I have tried changing the versions of wordpress itself, but nothing, it does not matter or content, or menus or anything.
I have followed all the steps, and I have imported the Player demo and it does absolutely nothing, it only installs the bar and the footer, nothing else. And that happens to me with all the other demos.
About 3 months ago I installed the template and everything worked the first time. But I had to reset the entire wordpress and delete everything and now when I install the template I have tried to put the demos it does not work well.
And I have seen that in version 5.5 of wordpress the template is bugged and does not load, but I have done a downgrade to wordpress to be able to use the template, and the demos do not work either.