1) Reupload the TinyMCE 2.0.3 stuff to the folder you used above.
2) Change the tiny_mce_gzip.php file in the scripts folder to include just:
// blah stuff here
You'll need to figure out what to replace blah with, but you can just cut and paste for the most part from the sample pages at MoxieCode.
Unfortunately, the JS version of TinyMCE is significantly slower than the GZIP'ed version, so be prepared for longer loading times.
You won't be able to use the tiny_mce_gzip.php file provided in WordPress b/c TinyMCE 2.0.3 requires a newer tiny_mce_gzip.php file, which works a different way, largely b/c 2.0.3 is structurally different from 2.0-2.0.2 and should really be called 2.1 or something.
If you download the EditorMonkey plugin, you can extract some of the plugins to use with TinyMCE 2.0.3. This will be necessary for some plugins like the WordPress, as the plugin architecture changed. You'll have to wait until next week though, when a version of EM support 2.0.3 is released with the new TinyMCE plugins.