The browser extension works for a remote computer, but requires the download of an installer to give access to our computer. By default a .deb, but it is exactly the kcp package that does not install anymore.
From what I've seen, based on AUR repositories, the new version includes new dependencies, so it makes the job more complicated.
My knowledge is not enough to update the kcp package. But if I do the facilities one by one, I will probably succeed, but the person I want to help remotely, and who uses the KaOS as well, is unable to do so. :/
It seems a contradiction, but KaOS is the easiest and most stable distro to use. I have installed on many family computers, people who barely know what Linux is, where they want to connect and use. KaOs is great for this as it meets all the requirements of a novice user with great tools for use outside the box. But sometimes, even rarely, I need to access these machines remotely to do some maintenance. So a tool like chrome-remote-desktop is a big help.
I'll search a little more about this update, maybe it's not as complicated as it seems...