Can't click the installation button

[lucakuehne]

Hi!
Today I tried installing EspoCRM on an IIS (Windows Server 2012 R2).
It all works fine until I get to the Installation screen. Where I have to choose my language and confirm with start. I cklick the button and nothing happens.
Please help me :/
Greetings Luca

[lucakuehne]

EDIT: That was on ISS, on XAMPP it works fine.