Now it may well be that there is a sticky that advises me to go to the index you suggest, but if like many, I come to this Forum off the Paint.Net Help tab as a one-off visitor, such a sticky is not obvious and I am left to find what I want by any means that comes to mind.
I have used Paint.net for photo processing only till now and as such have found my own way to do so. I now have a need to manipulate text for a totally different application and turned to the Paint.net forum for assistance. I went to the page on Tutorials and found this one
"3d-rotating-text-and-objects" by Yellowman
The procedure called up a plug-in called Polar Transformation by Madjik. The download link on the tutorial didn't work, a visit to Madjik page found a collection that stated it included Polar Transformation, but when loaded into Effects only Polar Inversion was there. Download links on Madjik's page to the plug-in I wanted didn't work, so what was I to do but go back to Google and do a search.
Now you are giving me a ticking off here for downloading from elsewhere and implying I am breaking the law, but then very forum that you are moderating would seem to be so full of broken links, faulty downloads and lack of guidance to the novice user that I do have to query its value for the likes of me.
I now have a recommendation from Pyrochild for 'Circle Text' from DPY, but am having the same problem of trying to obtain a working download of a single plug-in and not a collection of 50 or so, 49 of which I don't want!
I will explore your recommendation of the plug-in index and hope that will solve my requirement. As I said at the beginning I do hope that the error was mine in missing the guidance to this index - otherwise the irritation that comes through this post will be more than valid.
Rob