Any Microsoft Office Suite doc that you accessed in Win7 will also work in Win10, providing the suite is installed in 10.
If you have a legal copy of media then you can reinstall from the media.
Subsequently all available Office Suite updates will install (if you want) AND YOU WILL BE UP TO DATE. This is via the Windows Update Engine. (A check box needs a tick).
Also look online for the free Office Suite Readers from MS (Word. Excel, Powerpoint etc) that will allow you to read the files if that's all you want.
Do this BEFORE you start with all the other alternatives previously recommended.
The online version of MS Office is a subscription service that has fees associated. $$

There is no media, only downloads.
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