no, you can only upgrade 1 version at the time, this applies for program and the project files that been created in older versions.

if this post is the correct answer, please mark this answer as correct answer.

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Good Luck
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Hi Craig, 

thank you for contacting us. 
I'm sorry but we can not help you import the project you have created in your version 8 into your new version 11 for the reasons listed in the following post https://helpcenter.websitex5.com/post/101940

I suggest you open a new pubblic post and ask if someone in the community is willing to help you out with it. We have many users that offer this kind of service. 
Feel free to write back if you have anymore questions about this. 
Thank you,
Samantha