Fedora Widgets disappear on panel

I am running Fedora 30 with the following configuration: OS: Fedora release 30 (Thirty) x86_64 Host: Latitude 5580 Kernel: 5.1.6-300.fc30.x86_64 Uptime: 23 mins Packages: 3468 (rpm) Shell: zsh 5.7.1 Resolution: 1920x1080 DE: KDE WM: KWin Theme: Breeze Dark [KDE], Adwaita [GTK2], Icons: breeze-dark [KDE], Adwaita [GTK2], Terminal: konsole CPU: Intel i5-6440HQ (4) @ 3.500GHz GPU: Intel HD Graphics 530 Memory: 3196MiB / 7594MiB At first I installed two widgets: binary clock and comics strip to put on my panel but suddenly these two widgets disappear from my panel and from the widgets installer. Is there a way from command line or with file system to install them again ? Maybe should I add a specific source repository ? I tried with software center, look over the official package of fedora but nothing. I don't even know how to run these widgets (that I didn't uninstall from command line).