same thing here…
I try kubuntu on on a new pc before to migrate my old 22.04
and unabled to retrieve global themes
And the other hand, i have tested on my old machine and same issue
so, the issue seems to be global
Can confirm this on two machines. New install (ubuntu 24.04) and old install (22.04). It used to work on the old machine.
It seems anyone who’s using a relatively stable shipped distro is, yes. I have a fresh install elsewhere and a laptop running Debian 12.8, both running KDE Plasma 5.27.5. If this is truly an “ancient” version, can you please explain why the distros haven’t moved to a newer version, why version 5 is still seeing such heavy use, and/or if there is any expectation the community could have about support for version 5 for all of these distros in the future?
Same issue here, Debian Testing
5.27.11 KDE Version
I see it with Ubutnu and With Linux Mint (booth running KDE 5)
Same issue with Plasma 5.27 and Kubuntu 24.04.1 LTS. 
same problem with both kali, ubuntu and kubuntu. plasma 5.27
same issue Debian GNU/Linux 12.8
KDE Plasma 5.27.5
6.1.0-27-amd64
Wayland
Not a KDE dev, and I don’t know what’s up with the “Get New” screens not loading correctly, but for what it’s worth…the version Nate was referring to as ancient was Plasma 5.24.7, which is over two years old at this point. Plasma 5.27 is also “old” at this point too, though, simply in that it’s no longer generally being worked on by KDE developers.
Distributions like Debian, openSUSE Leap, etc. view it as a feature, not a defect, that they do not keep up with upstream development: DontBreakDebian - Debian Wiki
In that model, any bug fixes, security patches, etc. then usually become the responsibility of the packaging team for that distribution, since they are often intentionally not adopting upstream version updates even when they are for bugfix purposes (ex. KDE Plasma 5.27 had six additional bugfix releases after 5.27.5, up to 5.27.11, none of which were packaged by Debian).
Again, I don’t know about this specific issue, but on the general topic of “Why isn’t Debian/etc. on Plasma 6”, I figured that might be helpful context.
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5.27 is not ancient… it’s stable… and it’s supposed to be working.
they just need to the bottom of this and fix it.
that said, theming is not really a core feature (breeze still works fine) so i can understand why it would be a low priority.
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Had same error message with latest MX 23.4 and now with updated SpiralLinux.
Of course, these are “old” Plasma 5, but still…
I have the same problem
Just installed Debian 12 stable KDE 5.27.5, thats the KDE version i hope to run for the next 5 yers. so hope the KDE team will get this version to work it’s the one they run at ISS 
i’m working on updating my old still running server with debian 10 KDE 5.14.5.
Maybe that’s the reason the default Debian desktop still is GNOME
You install Debian Stable KDE the first thing you do is select a new Theme and there is an ERROR
Update: When I switch to KDE Neon the global theme works fine, so I really don’t know what’s the problem with other distributions
That’s because it’s KDE 6.
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after doing some digging, i found that it is not the system problem but the kde store is misconfigured for kde 5.27.5
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Would it be possible for kde 5.27.5 to adapt to the store, or is that a fix on the store side only?
I got the same error
Same error. So is the team working on it? Or just have no idea how the progress is going on?