Difficulties using Windows Installer to Deploy a COM Add-In - vb.net

Question

I created a COM Add-In in Visual Studio 2012 and when I compile and run it on my machine, it works perfectly. The problem arises when I try to use the Windows Installer I created to install the Add-In. I am trying to install this Add-In to multiple machines and I would like to figure out that the issue is with the installer.
When I try to call a Sub from the COM Add-In with Excel, it throws a 'Subscript out of range' on the second line. The Sub connects to a SQL server, performs a query based on cell data, and returns the result. I looked at the Add-Ins in Excel, it is installed and not inactive/disabled. This same code works perfectly if I compile the project on my machine, just not when I install the Add-In with the installer.
Dim com as COMAddIn
Set com = Application.COMAddIns("SQL") <----
com.Object.ConStr
I followed this guide for the installer:
https://msdn.microsoft.com/en-us/library/Cc442767.aspx
I did the following to get the installer running (just a summary of the above article):
Added the Primary Output, .vsto, and dll.manifest files to the
application files
Added .NET Framework 4.5 (full) and Visual Studio 2010 Tools for
Office Runtime as prerequisites
Set the INSTALLDIR
Specified that the application should deploy to the current user
Told the installer to create the following registry path
HKEY_CURRENT_USER\Software\Microsoft\Office\Excel\Addins\JACOB.SQL
Created the following registry keys
Description SQL
FriendlyName SQL
LoadBehavior 3
Manifest file:///[INSTALLDIR]SQL.vsto|vstolocal
Set the Build to SingleImage
Set the InstallShield Prerequisites to 'Download from the Web'
Set the Active solution configuration to SingleImage
Set the Configuration of the installer to SingleImage
Built the Installer
I made sure to uninstall the compiled version of my project from Excel then went to the following file path and ran setup.exe.
%Visual Studio 2012%\Projects\SQL\Setup1\SQL_Setup\Express\SingleImage\
DiskImages\DISK1
After the installer completed, I ran the same code as above and it returned a 'Subscript out of range' error. As I said earlier, the same code works if I compile the code.
Dim com as COMAddIn
Set com = Application.COMAddIns("SQL") <----
com.Object.ConStr
I have researched what the issue may be and have come up mostly blank. I have found that I may need DllRegisterServer/DllUnregisterServer methods to add my dll to the registry with Regsvr32, but I have no idea how to write these methods. I also don't see how this could be the issue if the compiled project works without these methods. Maybe the installer skips a step?
Any help would be GREATLY appreciated. Thanks!