Hello Maurice,

thank you for contacting us. 
I wish to inform you that if you would like to import the projects from your version 8 into your version 10, you should pass from version 9 first. Unfortunately, we do not offer technical support for this version of the program anymore https://helpcenter.websitex5.com/de/post/101940 but I do know that some of our users could help you out with this. Try searching through our help center for details. 

Thank you!
Samantha