Clean UI and the iOS 7 Theme APK VIRUS/MALWARE???

Hi. My name is Brad and I have an Android phone that I am trying to make look look like and iPhone with iOS. I downloaded the app Clean UI from the Google Play Store to make it look like iOS, but to design icons I need an external download of an APK from the Clean UI (formerly Espier) website. I need to install that and then use the icons. I installed that onto another Android device but the device itself said that it was unsafe. I was nervous, so I installed MalwareBytes Anti-Malware, Norton Anti-Malware, CM Security, CM Ghost Trojan Detector, and a few others. All said that the application was ok, but I am nervous since the Android OS threw up the red flag several times. I know nothing about coding, and was wondering if you could please help me by taking a look at it and telling me if it is safe.

Here is the link. It is the 1.8mb file.
files.espier.mobi/apks/hk.com.cleanui.android.theme.ios7-1.0.0-espier.apk

Anyone, please help. Thanks.