I want to install a basic version of office on my new PC. What is the cheapest product for a one time fee that I can download.?

Or Home | LibreOffice - Free and private office suite - Based on OpenOffice - Compatible with Microsoft for free and is compatible with Microsoft Office.

The absolute cheapest is using Microsoft 365 Online at https://microsoft365.com/ . It is free. See https://www.microsoft.com/en-us/microsoft-365/free-office-online-for-the-web . It won't have all the bells and whistles that the installed product has but it's very capable. The drawback is that it keeps your files online in OneDrive and there's only 5GB of storage for that. For $20/year, you can get the limit raised to 100GB. See https://www.microsoft.com/en-us/microsoft-365/p/microsoft-365-basic/cfq7ttc0ktxs .

"Basic" means what?

Not all vesrions/licence types are licensed for bus use https://www.microsoft.com/en-gb/microsoft-365/buy/compare-all-microsoft-365-products

Dear Malcolm Cooling,

Good day! Thank you for posting to Microsoft Community. I am happy to help you.

The latest one-time purchase subscription is Office Home 2024, and please refer to the screenshot below for details: Buy Microsoft Office 2024 | Microsoft 365

More information for you to reference：What's the difference between Microsoft 365 and Office 2024? - Microsoft Support

Thanks for your cooperation.

Sincerely,

Tin | Microsoft Community Moderator