You shall try to download office program using the office portal. All you need to have is a valid office account.
Login to office.com/myaccount to check your valid office version. Download to install office and activate.
To choose office version, you can check with the requirements. There are student version, business and professional versions available.
MS365 is a subscription based version which can let you access all the required apps.
You can also share the license to your personal computers if you choose MS365,
The standalone versions like Office 2021, Office 2019 or 2016 can only get one time license for single PC.