Thanks in advance for any assistance.

I am having a bit of trouble with add-ins.

I have a macro that, among other things, checks to see if a particular
add-in is installed and loaded into memory in Excel.

The problem is that if the add-in is not registered in the list of
available add-ins in the Tools-Addins menu it errors out in a subscript
out of error range.

I tried a number of ways to trap the error, none of which have been
successful.

Note: My code is neither clean nor pretty.

Examples:
dim myval as boolean

On Error Resume Next
If IsError(Application.AddIns("Unloaded Addin").Installed = True)
Then myval= false
---------------------------------
dim myval as boolean

If IsError(Application.AddIns("Unloaded Addin").Installed = True)
Then GoTo opt_out
' (other code


exit sub

opt_out:
myval = false
'return to main code
---------------------------------

Each of these generates the Run time error '9':Subscript out of range.

Any ideas on how to check this and not generate an error if the addin
isn't listed as "registered" with Excel?