They are essentially the same as software purchased from the 70s to the 00s though - shrinkwrap software, a term cleverly coined by Joel Spolsky. I just thought of it as buying software in a store at the time.
Perpetual license is also a good descriptor. If you have the same OS you downloaded it on, hopefully you have it backed up.
The scenario "we won't provide it for security reasons" only shows up as a gotcha. The author of that GitHub repo would know better than to use it.
I see that as more than a gotcha. It speaks to what the company really stands for if they say "yeah, we got it, you bought rights to use it, but nah, screw you". They're in no way obligated to provide the installer of course, but if they have the ability, I'd still complain if they don't.
Perpetual license is also a good descriptor. If you have the same OS you downloaded it on, hopefully you have it backed up.
The scenario "we won't provide it for security reasons" only shows up as a gotcha. The author of that GitHub repo would know better than to use it.