Witcher Enhanced Edition Installer stuck

I am stuck while installing Witcher Enhanced Edition. I already have the installer on Lutris but I am unable to remove and restart. I try installing using the same installer, but when I click Continue on the last screen the Continue button goes grey and I am not able to proceed further than this. I tried manually selecting files also tried default Download option provided by the installer script. I am stuck here, the continue button is greyed as soon as I click on it and I cannot proceed further. All the other options are enabled and I can change anything on the window except for the continue button. I left it overnight but it still didn’t work.