So i'm attempting to get Clean Installer on my new computer (running Windows 10 and Ultimate Collection). Now I seem to be able to download and install it fine but when I try to open it nothing happens. I get my standard Unknown application warning, click ok and then nothing opens. I don't get an error or anything. Anyone have any idea why this is happening?

Could be Windows Permissions for Controlled Folder Access. Go to Windows Settings - Update & Security - Windows Security - Virus and Threat Protection - Virus & threat protection settings -click on Manage settings - scroll down to Controlled folder access and click on Manage Controlled folder access - then, turn off Controlled folder access

If you have other virus software, check for permissions in that also.