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You will need the OWB standalone client for windows 64 bit. Even though you may have 64 bit database, the OWB client bundled there is not 64 bit.
OWB 126.96.36.199 Standalone client for Windows 64 bit (13365470)
Install 188.8.131.52 database, and use the 184.108.40.206 OWB client for it. There was an announcement on forum on the OWB 220.127.116.11 cumulative patch which is also advised, not sure if there are more, but it's worth checking.