Problem when using the demo content "One Click install'

Hi !

I’m pretty new to this, but i managed to do a fresh database for my WordPress website, but when i wanna try this One click install to have the demo content, it just won’t work. Makes Crash my install or whatever, i only know that after that, i just can’t reach the website anymore and have to re-install everything :/

What can I do to resolve this ?

Thanks for reading