Error with Curiosity Elements install?

Hello all,

Last week we wanted to upload some more images, but then we saw that the website didn’t look good. Completely different from a while ago. I logged in immediately and tried to fix the theme and didn’t get a good result.

This theme recommends the following plugin: Curiosity Elements.
Begin installing plugin.

Curiosity Elements: Click to Install

Then: Something went wrong with the plugin API.

Nothing is installed and gives errors, We run on php 7.4

Can you help me?

The page I need help with: [log in to see the link]