First open your Avro installation folder. Copy AvroSpell file (If your Microsoft Word version is 97-2003 then copy AvroSpell.dot file or is the version is New then copy AvroSpell.dotm file) from Addins folder.
Now open a explorer and go to your User folder( On Windows 7/8 your User folder location will be : C:\Users\USER-NAME
and on Windows XP it will : C:\Documents and Settings\USER-NAME
) and type on your location bar : " \Application Data\Microsoft\Word\STARTUP
" and paste it like this -
Sorry for Bad English!
I am using- Windows 8.1 and MS Word 2013
If you have any problems please feel free to post.