Zotero 7 32 and 64 bit both do not include the MS Word plugin.
I've updated on two different computers and both ran into the same problem. The MS Word plugin was not included with new versions of Zotero and I have spent an hour troubleshooting with no success.
https://s3.amazonaws.com/zotero.org/images/forums/u4839/2n1dl9v22ysz0hjmng2h.png
screenshot of problem on Zotero's end
https://s3.amazonaws.com/zotero.org/images/forums/u2433/it4kvuf7gz0a0idiysxd.png