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Perhaps this is my confusion, but on the web site I found it very difficult to find where to download the .nbm from for innertester.nbm For API support there is a link from the module home page. By the way, very useful module...thanks.
Proper presentation of experimental modules, NBMs, updates, etc. is in the works, I know it is somewhat confusing now. There is no direct link to innertesters.nbm currently published, but in NetBeans development builds it is made available through the Update Center so you can get it that way.