And try these updates:
https://support.microsoft.com/en-us/kb/3074482
It seems that certain versions of MS updater don't recognise the correct updates
oooh this update looks promising... my version of office is 15.11.2 whereas the update here is 15.12.3... fingers crossed.
You could also consider changing to a different App for your word/excel needs... Open Office is decent I hear and you can open your old word docs in it.
@ewanmac started
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And try these updates:
https://support.microsoft.com/en-us/kb/3074482
It seems that certain versions of MS updater don't recognise the correct updates