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Questions (config, theme, views, php...) Errors appears

Hello. I have installed my theme (Stockholm by themeforest) and I have some questions…
I have installed the theme and Its ok. But when I going to install required plugins, appears errors https://ibb.co/wMr08Bx

I install child theme and looks different. Text is out the box and image slider is zoomed

If you look real theme is this https://stockholm45.qodeinteractive.com/

The system information says this about PHP Max Input Vars https://ibb.co/TvTLf22

If i create a Live Link, the website dont show any images.

Please, someone can help me to fix all?

Someone knows?