Here is some instruction on how to install Shotcut beta in a Linux distribution with flatpak support
Add flatpak beta repo (user)
flatpak remote-add --if-not-exists flathub-beta --user https://flathub.org/beta-repo/flathub-beta.flatpakrepo
Install & run Shotcut beta
flatpak install flathub-beta --user org.shotcut.Shotcut
flatpak run org.shotcut.Shotcut//beta
Set default version to run in UI
flatpak make-current --user org.shotcut.Shotcut stable
flatpak make-current --user org.shotcut.Shotcut beta