For Visual Studio 2010 on Windows 7, I attempted @Chris Bayles suggestion and do not see ApexSql addins under Tools->Add-in Manager.
I followed @Jerome2606's pointer to https://knowledgebase.apexsql.com/remove-add-ins-just-visual-studio-retaining-sql-server-management-studio/ and it worked for me, but only when I removed the parent ApexSQL folder as well.
Summary of what is required to do:
Remove folder
C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\Extensions\ApexSQL
Depending on the version of Visual Studio, the version number in the default installation location will be different:
Product name Version number
Visual Studio 2010 Microsoft Visual Studio 10.0
Visual Studio 2012 Microsoft Visual Studio 11.0
Visual Studio 2013 Microsoft Visual Studio 12.0
Visual Studio 2015 Microsoft Visual Studio 14.0
Select and delete the ApexSQL folder and its contents.
Open Command Prompt as an administrator, then run
"C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe" /setup
Please note the command is different for Visual Studio 2012, 2013, and 2015.