I bought TurboTax from Amazon, installed the software, and entered the code. I continued using the launched product. Why is Intuit trying to charge me for software?

Sure sounds like you entered into the online version instead of the Desktop program on your computer.  When you filled out your return did you go online and log in?  And see a black column on the left side with the menu items, Federal, State, File etc.  That is Online.

The Windows Desktop program is blue across the top and the menu items like Federal, State, Review, File go across the top.

If that happened to you,  you can move your Online file to the Desktop program and continue without paying for Online or needing to reenter your info. Post back if you need to know how to move it to your Desktop program.

To continue in the desktop version see this…….

https://ttlc.intuit.com/community/choosing-a-product/help/how-do-i-switch-from-turbotax-online-to-the-turbotax-software/00/26129

After you get the program installed the first thing to do before you open your tax return .tax file is to update the program and install any state programs you had. Then open your file. So you first might need to start a fake return to be able to download the state program (go to FILE - NEW).