Cannot Install WordPress

Hi, thank you for being so supportive and helpful.

I have almost zero knowledge in website building, so thanks for being patience with me.

I have a free webhosting account, when i log into the cpanel, i go to the “Softaculous Apps Installer” and selected WordPress.

checked some relavant boxes of options. and selected a theme.

after i press the button “Install”, i get this error message:

“
The following errors were found :
Installation cannot proceed because the following files already exist in the target folder :
index.php
Please delete these files or choose another folder.OR
Select the checkbox to overwrite all files and continue
“

I have no idea what does this means and what should i do as a best solution.

For your information, i do not have a personally owned domain name yet. and my webhosting FreeHosting.com did not give me a domain name. do i need to have a domain name to install WordPress?

What is the best solution for me now, inorder for me to install WordPress?

Please feel free to ask me any information or details.

Thank you!