OK... do I need to install Tequila? I've had Icon on my pc since it first came out and for sentimental reasons, I've never uninstalled anything from CoH. I do not know if it is issue 23 or 25. Thanks!
The only two things you will need to access Paragon Chat are the City of Heroes game client and the Paragon Chat program itself. However:
1. The game client must be I24. Icon can work with I23 and I24, but PC will only work with I24. If you do not have the I24 client, you will need to download it. On my system the last I23 client has a cityofheroes.exe file that is 8764KB in size and has a modified date of 12/15/2011. The last I24 client I have (I24 was never released, but players would have it if they were beta testing I24 at the time of the shutdown) has a file size of 8848 and a last modified date of 8/24/2012. Also the beta client has a version.ini file with the build number 2400.201208211101.1. If you do not have the I24 client (specifically the last one), Tequila will download those files for you.
2. We know when Paragon Chat releases, Tequila will check for it and download it if it is available. There will probably be other ways to get it, but that way we know for certain.
So do you need Tequila? No. But you need the I24 client and the Paragon Chat software itself, and Tequila can get both for you. If you have the former and plan on manually downloading the latter when instructions for doing so become available, you don't absolutely need Tequila.