There are always unforeseen circumstances, and if your site suddenly becomes unavailable, there should be a backup site for downloading installation files. Create a GitHub account and distribute your releases there. Downloading from a third-party site (softportal, softpedia) is not safe, but it’s safe to download from an official github account.

I disagree. Github is for distributing source code, and eventually releases made from this source code. Just uploading binary artifacts without the code is not what git and Github was made for. If you need a backup of the installation, download the standalone client, and store it somewhere safe for yourself.