No, it's not necessary to download anything. All games within our databases are browser-based And do not call for any download or installation. That said, some older games demand Flash player, so you might have to install it in order to play A few of these games and do not https://info.undp.org/docs/dao/UNSP2015/Lists/PostSurvey/Item/displayifs.aspx?List=6e146e50-e299-46da-a20e-b9e885dace29&ID=69315