The old thread lacked quite a bit of information, so it's time to make a new one. First off, I should clarify what SMT Imagine is for the uninformed. It was an official MMORPG set after SMT 1 but before SMT 2. It has typical mainline SMT elements like demons, the world ending, alignments, etc.
It only lasted for a few years over in the west, but it only shut down in Japan last year. Thankfully for us, there's a chinese private server being run, and you can use the old english launcher to access it, fully localized. Here's a step-by-step guide on how to do that:
1. Register your account at this link, some have said your username and password need to be entirely numbers, but mine aren't, so see what works for you: http://imagine.acg7.com/
2. Download the chinese client here, and don't sweat the binary data. https://drive.google.com/drive/u/0/folders/0B-N4sj9SPl5kZVRPRnlIeWtWczg
3.Install the old english client here, but don't launch it once it's installed. https://gamefront.online/files/service/thankyou?id=13323597
4. Take the files from the root folder from the chinese client and move them to the american folder, do NOT move the applications or folders, just do what this screenshot Hibiki provided shows: Click to load png image (size - 40 kb)
5. Launch the Imagine client and it should work fine, now just log in and you'll be ready to play.
Hope this helped those of you who were confused, these steps should work right, just let me know if anything goes haywire.