how to install 365 after UNINSTALLING a previous version. Uninstall appeared to have been completed but I cannot install a new version (joining a family by invitation) .

This usually means the family sharing connection or the old Office installation is still stuck. Use this order:

1. Confirm the invited account is in the sender’s family group. If the invited account is already in another family group, it must leave that group first. Sharing only works after the invitee joins the subscription owner’s family group.
2. Reset the sharing connection.
   • The subscription owner should remove the invitee from the Microsoft Family group.
   • If the invitee still appears on the Microsoft 365 sharing page under shared people, stop sharing there too.
   • Then send a brand-new invitation.
   • When accepting the new invitation, sign out of other Microsoft accounts in the browser first and accept it with the exact same Microsoft account that received the invitation.
3. Completely remove any existing Office installation from the same Windows PC.
   • Use the Microsoft uninstall troubleshooter.
   • Click Open if prompted to open Get Help.
   • Follow the prompts and restart the PC when prompted.
   • This troubleshooter works for Microsoft 365, Office 2021, Office 2019, and Office 2016.
   • It requires Windows 10 or later.
   • It cannot uninstall Office 2024.
4. If Office is still not fully removed, manually uninstall Office. This is useful when uninstall looked complete but leftover components still block a new install.
5. Install Microsoft 365 again from the invited account after the new invitation is accepted.
   • Sign in with the same Microsoft account linked to the family invitation.
   • Go to the install/reinstall Office page and follow the install steps for Microsoft 365.
6. If installation still fails, check whether the PC is on a supported operating system. Microsoft 365 or Office will not install on unsupported systems.

Important notes:

• Office installs all apps included with the product together; individual app selection is not supported during install.
• Office can only be installed on the system drive where Windows is installed, usually C:.
• If switching between 32-bit and 64-bit Office, the currently installed bit version must be fully uninstalled before installing the other one.

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