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11203 ODP has a dependency on 11203 client, is that what they already have installed?
You don't have to "change the default home to the new one" as
1) that happens automatically when you install.
2) ODP.NET doesn't need to be the default home.
However, you may want to change the default home BACK to the old one depending upon what products you're using out of that home. You may also need to remove the ODP publisher policy files if you have apps that need the old version of ODP.
The best solution here is simply to add ODAC into a new home and create a new tnsnames.ora (or create TNS_ADMIN environment variable to point to the location of the other home instead).
Hope it helps,