Thanks to both of you.
Don, my path is a little different at C:\inetpub\wwwroot\aspnet_client\system_web\4_0_30319\crystalreportviewers13
I first set IIS Users to full permission, and then just for the heck of it "everyone"
I might have messed up things a bit installing and uninstalling the 32 and 64 bit versions of the redistributable and guess should clean up and do it over?
For what it matter, I do not use a crystal report viewer in my app (never done that, so not sure if this is relevant)
My code purely load a crystal report, set a database login on it which it then use to execute a stored procedure in the database to get it's data. Then export to file as pdf and return to the user (download)
The error I get is still the same as before.