Subject about says it all. I'm trying to troubleshoot an issue and need to have Toad temporarily use the Instant Client. Other pre-installed (i.e. inferior) client tools on my work laptop can use the Instant Client, but Toad doesn't see it.
I have a mix of instant and full clients. Toad should have no problem with that, except maybe switching from one client to another w/o restarting Toad. That one's hit or miss.
Do you not see the instant client at all? If not, have you rebooted since you added it to your path? I am pretty sure that is necessary for Toad to see the path change.