I was successfully using an older version of ODAC with Xojo, then I foolishly updated my local database to 12C and now I’m throwing an exception. It cannot find the provider and says It may have not been installed properly. So this is what I have done so far. This is a 64 bit database , I’ve installed the 64 bit OLEDB .dll and registered it and set the 64 bit compile option in XOJO.