excel vba - Check if an Add-in is installed and running VBA -

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i trying check if add-in installed , running. using piece of code: 

on error resume next:  set solvernome1 = addins("solver add-in") 'solver may have 2 different names set solvernome2 = addins("solver") msgbox isempty(solvernome1) msgbox isempty(solvernome2)  if isempty(solvernome1) , isempty(solvernome2)     msgbox "install solver add-in before trying install add-in.", vbexclamation     application.myaddinname.installed = false 'uninstall add-in end if

the problem solver uninstalled still isempty(solvernome1) = false condition clause doesn't work desired. guess there misunderstanding concept of installed or not. piece of code should using check if solver running?

enter image description here

answering on question: necessary access .installed property this:

myboolean1 = solvernome1.installed 'will return false because add-in set , not installed myboolean2 = solvernome1.installed 'won't return because add-in not set


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