Hi Arnaud,
You need to install a special setup with 1.1 support which can be downloaded from the following link,
http://www2.syncfusioncom/installs/v5.1.1.0/syncfusionessentialstudio11setup.exeUnlock key:
If you hold a Syncfusion license with a valid subscription, you can obtain your key for this version by visiting the "Download the latest versions" section within Direct-Trac and clicking on the appropriate key icon. If you''re currently evaluating our products or considering renewing an expired subscription, please write to salessupport@syncfusion.com to request a key.
Kindly let me know if you have any other questions.
Regards,
Ajish.