The Flatpak is already packaged and works well. It just needs to be maintained from a person that joins the Inkscape community.
This would allow further improvements like Portal support and making the app official on Flathub.
Update: One might have been found!
Your wanted option is not gone, you can still download the binaries if the author presents them; or you can compile it from source. This is just another, more convenient way to distribute the program.
If you are looking to get your programs Windows-style, to download a binary or “install wizard”, then you can look into appimages.
Like any form of distribution however: someone has to offer this, be it the author or “some rando”.
Appimages have no install wizard. And Windows executables have some weird signature verification which Appimages dont have at all.
If you mean downloading random stuff from random websites, yes.
But they dont have installers, so no verification, no moving to locations where executing is allowed (on Linux the entire home is executable which is a huge security issue) no desktop integration, no context menu, no file associations.
And Windows executables have some weird signature verification which Appimages dont have at all.
EDIT:
Appimages have no install wizard.
Appimagelauncher, gearlever, AM, etc. Which is the same as a install wizard since it integrates the appimage into the system. AppImages do not need to be extracted into the system which is what windows install wizards do.
Appimages came before these tools, and the tools (forgot the name GearLever, AppimagePool is another one) came afterwards.
They are structurally better as they are external.
That verification is interesting. So it is another appimage, used to verify appimages? Are all Appimages using that, if not what percentage of the ones you know? And are tools like Gearlever enforcing or using that signature check?