How to update survey solutions in my cloud service?

when i import my questionnaire in to my survey solutions system, i was told that “My questionnaire contains new functionality:New set of functions and geography question in conditions.New feature(s) is not supported by your installation.Please update.” so,if I need to download survey solutions 18.6.4 to my cloud service and install it? and what if i have old version.what should i do to make sure my old data security?

Since it sounds like you’re hosting your own cloud instance of Survey Solutions, have a look at this thread : Update Survey Solutions