Couldn't install. We're sorry, we had a problem installing your Office program(s).
Error Code: 30088-1021 (0)
1. Make sure all Microsoft Office version/component uninstall from the computer. (Include visio, project and others)
2. Use Microsoft Office fix it tools to uninstall other version of Microsoft Office.
Fix it script Download
4. Make sure the installer no problem. Can download o365 proplus from here: Office365 Proplus Offline Installer