Hello,
Could you go through the posts in this thread and see if it helps MS Excel Add-in not installed - #41 by dragos.suma ? Even if it does not help right now it gives you information on how to debug it and of course what logs and of what quality we required to begin and understand why is the plugin not working on your machine 
Regards,
Dragos.
Anil_G
Ajay_Mishra
pravallikapaluri
postwick
AJ_Ask
Anonymouss
vignesh.maruthappan
mkankatala
mrohan.senapaty
ATHEEQ_UR-RAHMAN