

User account permissions: You should log into an administrator account on your Windows PC or have administrator authorization to install Microsoft 365.If your computer has insufficient space, you will run into problems installing the app. Insufficient disk space: Microsoft 365 and Office Home & Student 2021 requires a certain amount of free space to install successfully.Corrupt installation files: The Microsoft 365 or Office Home & Student 2021 installation files might be corrupt or damaged, preventing the installation process from completing successfully.If your system is incompatible with the version you're downloading, you will encounter an error during installation. System requirements incompatibility: Whether installing Microsoft 365 or Office Home & Student 2021, each Office version has system requirements your device must meet.

Although there are several reasons why Microsoft 365 and Office Home & Student 2021 installs fail, these are the most common reasons:
