Some apps are distributed as Split APKs (multiple .apk files packaged together) to optimize resources. Standard Android installers cannot open them.
SDK Update
Pfizer Kit Verify app provides the clinical user quick and simple means for verifying selection of the proper patient kits before dispensing to participants in a clinical study.
com.pfizer.us.kitverify on the APK Downloader.This APK download is 100% safe. We verify that the cryptographic signature of the file matches the official developer credentials. No modifications or adware are injected.