How to find the missing Gaaiho toolbar/add-in in Word?

There are three possible causes and the solutions are listed below.

Cause A: Gaaiho Word tool bar is hidden
Solution:
1. Right-click on Word tool bar and select "Customize Quick Access Toolbar" from the menu.

2. In the Word Options dialog box, select "Add-Ins" in the panel to the left and choose "Gaaiho Office Addin" from the list of Add-ins.

Cause B: After installation, the related PDF Word add-ins are not successfully registered
Solution 1 (recommended):

1. Go to "Programs and Features"
2. Select "Gaaiho PDF Suite" and click "Repair"

Solution 2: 

1. Click "Start" and search for "Command Prompt" (In Windows 7, go to "Accessories")
2. Right click on "Command Prompt"(cmd.exe) and select "Run as administrator".
3. Depending on the system types of Windows and Office, enter the corresponding command into "Command Prompt".

• For Windows 64 bit + Office 32bit

Enter regsvr32 "C:\Program Files (x86)\Zeon\Gaaiho\Gaaiho PDF Suite\PDF Driver\OfficeAddIn\ ZPDFOfficeAddin_x86.dll"

• For Windows 64 bit + Office 64bit

Enter regsvr32 "C:\Program Files (x86)\Zeon\Gaaiho\Gaaiho PDF Suite\PDF Driver\OfficeAddIn\ ZPDFOfficeAddin_x64.dll"

• For Windows 32 bit + Office 32bit

Enter regsvr32 "C:\Program Files\Zeon\Gaaiho\Gaaiho PDF Suite\PDF Driver\OfficeAddIn\ ZPDFOfficeAddin_x86.dll"

Note: Please select the hard drive on which the product is installed

Cause C: Add-ins are closed or disabled
Solution: 

• For Microsoft Word 2010 & 2013

1. Go to "File > Options > Add-Ins".
2. Choose "COM Add-ins" at the bottom and click "Go".
3. Finally, check "Gaaiho Office Addin"

• For Microsoft Word 2003

1. Run Word 2003 and select "Help > About Microsoft Office Word"
2. Click "Disabled items . . ." button. If Gaaiho PDF Word is listed, please select it and click "enable" button to display Gaaiho menu items and tool bar icons
3. Alternatively, click "tool > Marco > Security" and select "High" or "Medium" in "Security Level" tab
4. Select "Trust all installed add-ins and templates" in "Trusted Publishers" tab