Install problem

Hi skywarriors, I am trying to install arcane theme (I had blackfyre before)
I attempt multiple time to install the new theme but when activating it or trying to see alive the cloudflare plage show on and tell me that there is an issue with my server.

I removed all files and database and I re installed all from scratch but it doesn’t work either. (now blackfyre don’t work either)

Have you an idea what could happen ?
I can send you my access in private if you want, let me know.