Version 3

Delete Registry Keys

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Word\Addins\Chem4Word V3
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Office\Word\Addins\Chem4Word V3
HKEY_CURRENT_USER\Software\Chem4Word V3

Delete Folders

C:\Program Files (x86)\Chem4Word V3
C:\ProgramData\Chem4Word.V3
C:\Users\Owner\AppData\Local\Chem4Word.V3

Version 2

Delete Registry Keys

HKEY_LOCAL_MACHINE\Software\Microsoft\Office\Word\Addins\Chemistry Add-in for Word
HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft\Office\Word\Addins\Chemistry Add-in for Word
HKEY_CURRENT_USER\Software\Chem4Word

Delete Folders

C:\Users\Owner\AppData\Local\Chemistry Add-in for Word