Alternatively, build it from source yourself from the GitHub repository.
Install a static site generator
Doxide produces Markdown. You can use a static site generator to further convert that to HTML for display through a web browser. MkDocs and Material for MkDocs are recommended. To use them, you will need a working Python installation. Then, install with:
pip install mkdocs mkdocs-material mkdocs-material[imaging]
To manage MkDocs and other Python dependencies per project rather than system wide, you may like to use a Python virtual environment. Create it in your project directory:
python3 -m venv venv
Then enter it:
source venv/bin/activate
You can then run the above command to install MkDocs and Material for MkDocs into this virtual environment. When finished using the virtual environment, exit with:
deactivate