If you are physically at an Alibaba office, you can often download the app via the "portal page" after connecting to the Guest-wifi hotspot. Installation Steps for Android
This is the most critical step. Do not simply click the first link that appears in a search engine. Many malicious sites disguise malware as the Alilang APK. Here is how to identify a reputable APK repository:
Identifies users and detects terminal security to manage corporate intranet entry.