ChemOffice menu does not appear in Excel. How do I load ChemDraw for Excel?

Have a look at the ‘disabled items’ in Excel, according to the following versions of Excel.

For Excel 2010/Excel 2013/2016/2019/2021/Office 365

1. Launch Excel and select “Option” from the File menu.
2. It will open the Excel Option dialog box, click on Add-ins.
3. In the details pane, locate the add-in in the Disabled Application Add-ins list
4. The Name column specifies the name of the assembly, and the Location column specifies the full path of the application manifest.
5. In the Manage box, click Disabled Items (select “Disabled Items” from the drop-down list for “Manage” in the Excel Option dialog box), and then click Go.
6. Select the add-in and click Enable and click the Close button.

For Excel 2007

1. Launch Excel and click the Microsoft Office Button.
2. Now click the Excel Options button, it will open the categories pane, click on Add-ins.
3. In the details pane, locate the add-in in the Disabled Application Add-ins list.
4. The Name column specifies the name of the assembly, and the Location column specifies the full path of the application manifest. 
5. In the Manage box, click Disabled Items (select “Disabled Items” from the drop-down list for “Manage” in the Excel Option dialog box), and then click Go.
6. Select the add-in and click Enable and click the Close button.

For Excel 2003

1. Launch Excel 2003
2. Go to the Help menu and select “About Microsoft Excel”, it will open the “About Microsoft Excel” dialog box.
3. Click the “Disabled Items” button on the “About Microsoft Excel” dialog box.

Now check the “Disabled Items” dialog box. If you have the "ChemDraw for Excel" add-in listed, select and click the “Enable” button and retest the problem.