I have Rapidweaver 7 (version 7.5.5) and use the Tesla Pro theme from Elixir Graphics (my website is www.organisationdynamics.ie).
I upgraded to High Sierra recently and when I opened Rapidweaver I got the error Project Theme is missing, . A realise this is similar to previous topics. I contacted Elixir Graphics who suggested I download the theme again. I did so to no avail. Also, when I create a new project, the Tesla Pro theme is available.
Any help would be gratefully appreciated.