Where do I download the free WordPress software to build my own blog website?
It depends how you wish to download and install it, but if you are just looking for the latest ZIP file you can get that here:
Download
If you want to see all of the versions and all the ZIP files you can go here:
Release Archive
If you trying to download it to your cloud server, you can use wget
wget
For example: sudo wget https://wordpress.org/latest.zip will retrieve the wordpress.zip file of the latest WordPress version
sudo wget https://wordpress.org/latest.zip
SlickStack can do it for you:
https://github.com/littlebizzy/slickstack/blob/master/bash/ss-install-wordpress-core.txt
Enter the destination URL
Or link to existing content