If the program downloaded from the vivo phone you are using cannot be installed, you can try the following operations:

1. Allow the installation of software from unknown sources: Go to Settings--Applications and Permissions/More Settings- -Permission management--Permissions--Install unknown applications--Select software--Turn on "Allow installation of unknown applications";

2. When installing software, it prompts insufficient memory: enter i Butler--Space Management-- Scan and clean the junk cache, uninstall rarely used software on the phone, enter file management, and clean up videos, songs, compressed packages, etc.;

3. When installing the software, it prompts a parsing error: re-download and install or change the official website Download from a regular platform;

4. System version restrictions:

Enter Settings - System Upgrade to check whether the phone is the latest version. If not, you can try to upgrade to the latest system; ( Some iQOO (Monster) UI version/Funtouch OS9.2 models need to enter Settings--My Device--iQOO (Monster) UI version/Funtouch OS version to view)

5. The software is not compatible with the mobile phone : Replace with other versions or install and use other software of the same type.