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Built from: Echo 2.0.4: much less CPU while Echo's window is open (the RGB theme pauses when Echo isn't in front), and the Linux AppImage starts on more systems.
Windows: download Echo-Setup.exe (installs Echo with a Start menu entry) or Echo-Windows-portable.zip (no install: unzip it anywhere and run EchoClip.exe). Both are signed with a Certum open-source code-signing certificate. The certificate is still new, so if Windows says it protected your PC, click More info > Run anyway.
Linux: download Echo-x86_64.AppImage, make it runnable (right-click > Properties > Allow executing, or chmod +x) and start it. Also needs gpu-screen-recorder + ffmpeg from your distro.
(Echo-linux-x86_64.tar.gz = the plain program, smaller; it also needs your distro's mpv library to play clips - Fedora/Nobara: mpv-libs, Ubuntu/Debian: libmpv2, Arch: mpv - see README.txt inside.)
Windows build: success / Linux build: success