Miss Anita is excited to use a new software which is freely available to download but she cannot modify or change the source code. Anita is using:

Software is a set of instructions, data or programs used to operate computers and execute specific tasks.

Key Points

• Source code is generally understood to mean programming statements that are created by a programmer with a text editor or a visual programming tool and then saved in a file.

Important Points Freeware: 

• Freeware is software that does not require a paid licence to use it, any fees or donations, a limit on how often you can download or run it, or an expiration date.
• Freeware (not to be confused with free software) is a type of proprietary software that is released without charge to the public.
• If the software has ads, then it is not considered freeware but rather adware.

Thus, the answer is freeware.

Additional Information

• Open-source software is code that is designed to be publicly accessible- anyone can see, modify, and distribute the code as they see fit.
• Firmware is software that provides basic machine instructions that allow the hardware to function and communicate with other software running on a device.
• Liveware is a slang term used to denote people using (attached to) computers, and is based on the need for a human, or liveware, to operate the system using hardware and software.