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Your LimeSurvey version: LimeSurvey Community Edition Version 6.6.3+240909 
Own server or LimeSurvey hosting: Own Server
Survey theme/template: Sea Green
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I imported a survey in LSA from LS version 3.7.1+180424 to LS 6.6.3+240909. The result was:

 

What is the meaning of "This survey setting has not been imported: faxto =>" and "The email attachements have not been imported because they where in an old format." warnings? What can i do to retrieve all files and settings from the source survey?

Thanks