Thanks so much, I appreciate the help! :)

Okay, I can view what needs to be changed in a browser window by clicking on the product in Extracted Files, but I have no idea how to edit it or even where it is. Any chance someone could tell me? Pretty please? :)

lostgirl815 you don't need change files.
just install product . make database backup . run sql query by mysql client (phpmyadmin or other). text located in message above (alter table)

Thanks very much for the instructions, netwind!

I have this installed and have my members using it in their personal journal forums.

is there a way I can make it where Mods/Admin can not auto-read it? Since I want it to stay private for the members to feel they have privacy in journals, etc.

Best way to do it is install (and buy) vbulletin journals product. This hack focus on other purpose.

This is a great hack but do you have one for 3.7 as I need this ASAP and I can't see a 3.7 version!

just install this version

I used to have it on a vB 3.6 board. When upgrading to vB3.7 I deactiveted it. Now I downloaded the newest version of this mod and installed it. Made all the uploads and when installing the product I activated the option to overwrite the existing product (since I had the 0.2 version installed).
Now what happens is that I have nowhere that I can switch it on. Not the forum settings, not in the vB settings.

Any idea what to do?

Did you see menu Plugins&products, product "Password protected threads" ? Turn this product on.

If you not uninstall it.