Hello Ajay,
We have some data in easysocial, if we download and install new version we lost the data.
May I know what kind of data are you mentioning here? Installation or upgrading of easysocial will only override the change that you have made in the core files of easysocial but it will not touch your current easysocial settings that you saved from the backend.
It is always advisable for you to perform the backup first prior to updating to prevent any unintentional loss of your easysocial data.