I want to update a version 10 website 
Auteur : Barry H.
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I have a version 10 website that i wish to upgrade, i get the eroor message created with a version prior to 2020.2 website X5 when opening.
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Barry, the current versions cannot open anything prior to v11.
You appear to own v11 so I suggest you make and iwzip of the V10 project (step 5, export project), import that into v11 and create a new iwzip. Then in the current version you should be able to import your project.
However, given how much websites and WX5 have changed, it may be simpler to just recreate your website.
Auteur
Thankyou, i have downloaded version 10, however i no longer have the registration key for this version
Barry, click on your name (top right this page), select my profile. You will find a license keys and a download folder. In here you should find what you need to install both v10 & v11
Hello!
Another solution:
https://helpcenter.websitex5.com/fr/post/252737
Good luck,
J.P.