I was downloading a program onto my calculator (my first, BTW) and TI Connect asked me to replace "(null)" with the program. I selected replace and now that game and another game I'm trying to download (Portal Prelude [looks awwwwwesommmme] won't work. Does anyone know whathappened?

Well first off so the rest of the community doesn't bash you, it is usually a good idea to not post within such a short time on the same topic. It is better to use the quick modify button. For Ti Connect it has a bunch of issues, the way i do it is as follows:
-Connect your calculator, it should turn on by itself.
-Go into Ti-Connect and select Ti device explorer
-Select your calculator
-Open up your documents and drag and drop the zipped or folder into the calculator
-Next select the programs you want in the dialog box
-You have your program