sorry for the delayed response. when you upgrade to 18.104.22.168, you need to run the FlexSync Foundation and FlexSync Formulation installers located in EP 3.3, including applyscripts. If you already have FlexSync installed, this will perform an upgrade for you.
There is an issue with the applyscript that break the translations in the sitemap to display 'no translation found for ...'. We are correcting this in EP 3.4, but in the meantime, after you run applyscript, you can execute the following query to correct it.
update commonXLAExtensionCacheItem set fkparent = (select pkid from commonXLAExtensionCache where name = 'frmMaster/ctlNavMenu1') where id in ( 'lblFlexSync' ,'lblSingleFormulaPerExp' ,'lblFSImport' ,'lblProtoExperPerExp' ,'lblFormulaExportRpt' ,'lblSingleFormulaQtyExp' ,'lblFormulaImportRpt' ,'lblProtoExperQtyExp' ,'lblFSExport' );