I doubt this. I think it may be related to the fact that
the NAME of the addin has a conflict.. and the addin collection cannot
create a unique 'key for it's index.

If the addin's Title property is EMPTY the filename will be used
as a key to the addins collection. If the Title is not empty the Title
will be used.

If the Title is not unique... the conflict may arise.

I've just tested with a small .vbs which added 100 addins without
problems.




--
keepITcool
| www.XLsupport.com | keepITcool chello nl | amsterdam


Bennie Douma wrote :

Set oXL = CreateObject("Excel.Application")
oXL.Workbooks.Add
Set oAddin = oXL.Addins.Add(..\"MyAddin.xla",True)
oAddin.Installed = True
oXL.Quit