Nothing mentioned above works for me any longer. I did manage to get this working by this lengthy process:
1) Install Windows XP 32-bit VM through VirtualBox on my computer (Quickest approach mentioned here
2) Install VirtualBox guest additions
3) Install the easyzapper 0_5_1_4_88.exe file in the XP VM
4) Remove battery from TC-30, and plug in/power by USB
5, ?, ?, ... *) Associate the TC-30 with the VM through VirtualBox interface every time it restarts
6) Use the harmony interface available at www.mactc30.com
(I pray they don't let the domain expire any time soon!)
7) Create an account not associated with any harmony remotes, and associate it with the TC-30.
8) Setup Harmony 7.7 on a different computer that has never been used for any harmony remotes and login with the credentials I used to setup the TC-30 on www.mactc30.com
9) URL Encode (Not decode) your email address and password individually at this address: http://meyerweb.com/eric/tools/dencoder/
9) Visit this specific address to get around some annoying forced-logout bug:
com/EasyZapper/New/Main.asp?WebProcessAction=Start&ClassId=HarmonyProcess%2EProcLogin&RelativePath=ProcLogin%2F&ReturnUrl=%2E%2E%2FUserHome%2Easp&AccountType=Normal&Error=&Logout=False&BrowserType=Mozilla%2F4%2E0%20%28compatible%3B%20MSIE%206%2E0%3B%20Windows%20NT%205%2E1%3B%20SV1%29&UserName=URL ENCODED EMAIL ADDRESS
&Password=URL ENCODED PASSWORD
10) Configure your remote on the Harmony 7.7 interface on your alternate computer. It's much easier to use than trying to work around the screwed up interfaces in the HK interface. If it tries to get you to plug in your remote, grab the HEX file from the virtual machine and run it on the machine with H7.7 installer.
11) Click update in the mactc30 page above after going through the hoops to get your remote ready to program. The update button is probably going to be partially obscured on your VM, it's the very bottom one if you can't read it, on the main page. Make sure you have a resolution of 1024x768 or higher on the VM, and your browser window is maximized. (See screenshot: http://i.imgur.com/pAIl0b9.png
12) Follow through the steps like you would a normal harmony remote, and you should be good.
I'm sorry to be the bearer of bad news that this is such a hassle, now, but that's just the fact of the matter. It's too bad, especially since the TC-30 had all the advantages of the best Harmony remotes of that generation, and the size of the smaller remotes.
Also side note: Set a slideshow with a black image, and a black background for your TC-30 if you want to save the screen life. It burns in the default image very quickly, in my experience. You'll find those in the H7.7 panel under "Remote Settings" tab.
Let me know if you have trouble with the above technique, as I mentioned, that URL might break again down the road.
Also, side note: it looks like the URL I mentioned above works in Chrome for me... What the... What a waste of time!