This application was downloaded and set up by over 100M users and the latest stable release was on Oct 10, 2019. Pay attention to adverts and in-app purchases while launching the app. A free .apk file of Dual Space 2.1.5 can be downloaded from Droid Informer and you can read users' reviews on this site. Prepare 5 MB of free space on your device for this app installer and keep in mind that it requires Android 4.1 and higher.
According to the users’ opinions, you can find such a drawback of the app as video ads.