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If Chem4Word appears to be installed correctly but does not start, please verify that Chem4Word has not been disabled by Word.
Adobe Acrobat Pro has been known to prevent earlier versions (prior to V3.1.6) starting up and thus being disabled and once in this state it is “sticky” until manually unblocking it.
You can check this by going to word options.
Click on Add-Ins [1], select “Slow And Disabled Add-ins” [2], then click on Go
If Chem4Word is showing in this list please select it then click on enable.
It is also worth checking the list of Disabled Items as well select “Disabled Items” [2], then click on Go
If Chem4Word is showing in this list please select it then click on enable.
You may need to restart Word to get the Add-In fully working.