To use Qubes, we can download its ISO image from its official website:

https://www.qubes-os.org/downloads/.

To install Qubes on a computer, it is recommended you have a minimum configuration as mentioned here:

• 64-bit Intel or AMD processor (x86_64 also known as x64 aka AMD64)
• 4 GB RAM
• 32 GB disk space

Qubes can also be installed on systems not meeting these recommended configuration, however the performance may be slow.