I was able to load Office XP and Office 2003 on Win 7, so try loading it on Win 8. MS will tell you it will not work - even on Win 7, but it works just fine for me. The new Office is "in the cloud" and not on your computer. Not very good if you are without wifi somewhere.
Libre Office and Open Office are basically the same software. Libre is a carry forward of Open Office continuing to be developed by the original Open Office programmers. Both work well as an alternative to MS Office - completely compatible with all current and old Office files - and the best part is it is free!