Cannot load OCI DLL error after upgrade and/or copy user settings

I currently have Toad for Oracle 12.1 installed on my laptop. When I install 12.6, my user settings are getting automatically imported into the new version. The problem is when I try to connect to a database, I get this error:

Cannot load OCI DLL: C:\app\mgtessier\product\11.2.0\client_1\BIN\oci.dll

The oci.dll doesn’t currently reside in the \BIN folder, nor did it with the 12.1 version. I’m using Windows 7 32-bit, and I’ve installed 32-bit Oracle InstantClient and every version of Toad that I’ve installed has been 32-bit.

I’ve also reproduced this error with a clean install where I used the Copy User Settings utility to copy my 12.1 settings from my network share to the new install. Before importing my settings, I tried to connect to a database and it was successful. Only after I import my user settings does database connections fail.

I read that copying user settings from version to version is only supported within 2 release versions, so I’ve tried to install 12.5 and 12.5.1. 12.5 would hang when I tried to run it, and 12.5.1 has the same issue that I’m experiencing now with 12.6.

I have a lot of custom settings in my installation of Toad (code formatting, layout, etc.) that I’d really like to preserve going forward rather than have to figure out how I set them up out all over again.

Any ideas what I did wrong? How do I fix it?

Thanks in advance,

Mike