Unable to install AMD GPU PRO on my computer (+ screen flickering)

I fail to install the AMD drivers on my computer. Could you guys please help me? I tried many workarounds but non of them seemed to work for me.

I thank you in advance for your help and efforts.

Hardware

CPU:Ryzen 5 1500X GPU: XFX RX 580 GTS XXX Edition

With best wishes, Sándor