Go to
https://education.ti.com/en/software/search/
In the technology drop-down list, choose (TI-83 or TI-84, etc.)
Click the TI-83 Plus (or) TI-84 Plus ... Operating System
In the next page you need to surrender your information to download that operation
system. (For TI-73, you do not need to surrender).
Save that OS (Operating System) file in the same folder as "Wabbitemu.exe" file.
Double click the "Wabbitemu.exe" and run.
If you have run already and installed a wrong version, then you will see a calculator you
do not want, click "Help" and click "re-run setup wizard”)
Click “Create a ROM image using open source software”.
Click “Next”
Click the correct version, the same as the OS downloaded from education.ti.com website.
Click “Next”.
Click “Browse for OS files on my computer”
Click “browse..”
Find the OS you downloaded from education.ti.com.
Click “Open”
Click “Finish”
You will be ask to save as .rom file. Give a name ti_83
Claculator may automatically open.
Click “View”.
Click “Enable skin”.
Click □ .
Aftewr closing.
Go to that folder.
Double click “Wabbitemu”.
To reinstall the other calculator. Click “help”. Click “Re-run setup witzard”.