Hi Vivienne,
Please see the following:
https://support.microsoft.com/en-us/office/download-and-install-or-reinstall-microsoft-365-or-office-2021-on-a-pc-or-mac-4414eaaf-0478-48be-9c42-23adc4716658
- Go to www.office.com and if you're not already signed in, select Sign in.
**Note:**If you're using Microsoft 365 operated by 21 Vianet, sign in with your work or school account to login.partner.microsoftonline.cn.
If you're using Microsoft 365 Germany, sign in with your work or school account to portal.office.de.
2. Sign in with the account you associated with this version of Microsoft 365. This account can be a Microsoft account, or work or school account. I forgot the account I use with Office
3. After signing in, follow the steps that match the type of account you signed in with.
You signed in with a Microsoft account

1. From the Microsoft 365 home page select **Install apps**.

2. Select **Install** (or depending on your version, **Install apps>**).
You signed in with a work or school account

1. From the home page select **Install apps**(If you set a different start page, go to [aka.ms/office-install](https://aka.ms/office-install "aka.ms").)
Notes:
- For Microsoft 365 operated by 21 Vianet go to [login.partner.microsoftonline.cn/account](https://login.partner.microsoftonline.cn/account "login.partner.microsoftonline.cn").
- For Microsoft 365 Germany go to [portal.office.de/account](https://portal.office.de/account "portal.office.de").

2. Select **Microsoft 365 apps** to begin the installation.
The 64-bit version is installed by default unless Microsoft 365 or Office detects you already have a 32-bit version of Microsoft 365 or Office (or a stand-alone app such as Project or Visio) installed. In this case, the 32-bit version of Microsoft 365 or Office will be installed instead.
To change from a [32-bit version to a 64-bit version](https://support.microsoft.com/en-us/office/choose-between-the-64-bit-or-32-bit-version-of-office-2dee7807-8f95-4d0c-b5fe-6c6f49b8d261?wt.mc_id=SCL_InstallOffice_Home# "support.microsoft.com") or vice versa, you need to [uninstall](https://support.microsoft.com/en-us/office/uninstall-office-from-a-pc-9dd49b83-264a-477a-8fcc-2fdf5dbf61d8 "support.microsoft.com") Microsoft 365 first (including any stand-alone Microsoft 365 apps you have such as Project of Visio). Once the uninstall is complete, sign in again to [www.office.com](https://www.office.com/ "www.office.com") and select **Other install options**, choose the language and version you want (64 or 32-bit), and then select **Install**. (See [Install Visio](https://support.microsoft.com/en-us/office/install-visio-or-access-visio-for-the-web-f98f21e3-aa02-4827-9167-ddab5b025710 "support.microsoft.com") or [Install Project](https://support.microsoft.com/en-us/office/install-project-7059249b-d9fe-4d61-ab96-5c5bf435f281 "support.microsoft.com") if you need to reinstall those stand-alone apps.)
Notes:
- For Microsoft 365 operated by 21 Vianet go to [login.partner.microsoftonline.cn](https://login.partner.microsoftonline.cn/account "login.partner.microsoftonline.cn").
- For Microsoft 365 Germany go to [portal.office.de](https://portal.office.de/account "portal.office.de").
- This completes the download of Microsoft 365 to your device. To complete the installation, follow the prompts in the "Install Microsoft 365" section below.
Tip: Don't see an install option after signing in? There could be an issue with your account. Select Need help? from above and review the solutions under Account questions.