The above Microsoft office 365/2021/2019 installation error code 30045-4 primarily appears when you try to open Office 365 program on Windows 10 computers .It has been observed that this office 365/2021 installation error 30045-4 needs to repair or a reinstall and you can read the below information for more knowledge.
https://livesupportonlinechat.com/en-us/error-code-30045-4/