There is a KDE-specific flavor of Trisquel, called Triskel.
I know how to find the Trisquel 9.0 with KDE, but I looked and couldn't find Trisquel 8.0 with KDE.
If you are interested in Triskel 9.0 heres the link: http://jenkins.trisquel.info/makeiso-etiona/iso/20200117/ you can find amd64/i686 version, whichever one you need.Be aware that 9.0 is in beta and is not yet stable so packages might be broken.
