I remember being in the Serif forums asking the developers to make features such as Shape Builder Tool among others and waited for someone to answer our questions. But no one did. Now we are hearing that the new version of Designer will have these things and even more. But now...there isn't any update nor is it available for Mac OS High Sierra. The long awaited update is now an upgrade and in order to get it, you have to buy a new computer. Not cool Serif . You forgot about the rest of us.
I'll be going back to Illustrator (more robust, even though it has a monthly hefty price but it's compatible to my Mac OS 10.13.6.) What a great way to alienate the people who got you there.