If the download didn't start, please click the button above.
1.(First time only) Please go to Settings > Apps > Chrome (or
other browser like UC) > Install unknown apps > allow from this
source , and turn on Allow from this source, this step enables you
to install apps out of Google Play.
2.(First time only) After turn on Unknown sources, you could move
to Downloads. Then you can click the downloaded Umum apk to
install.