itch.io

From the website it worked fine. Could just login, download the game, set permission as executable, double click to launch.
So the actual file runs fine.

The only thing I am wondering is whether butler is trying to handle the binary as an installer, while the game does not appear to need any installing, but can be run directly. So installing from the app fails, since the file is not an installer and butler tries to handle it like one.

Not sure if it helps, but when I download the file (TrackMaster_0.1_Demo.x86_64) through the website, I can launch the demo fine (after setting the permission for executables as is normal on linux).

It seems to be something about being launched from the itch app itself breaking it. (Itch is fully up to date btw, checked for updates during testing)

On Ubuntu 20.10 I get the following error for both demo and full version:
Following is taken from the itch app log:

{"time":1613990952244,"level":30,"msg":"(opening file took 195.338557ms)","name":"m/reac/down/driver"}
{"time":1613990952244,"level":30,"msg":"Determining source information...","name":"m/reac/down/driver"}
{"time":1613990952244,"level":30,"msg":"↝ For source (TrackMaster_0.1.1.x86_64)","name":"m/reac/down/driver"}
{"time":1613990952244,"level":40,"msg":"  No mapping for file extension (.x86_64)","name":"m/reac/down/driver"}
{"time":1613990952244,"level":30,"msg":"Estimated disk usage (accuracy: guess)","name":"m/reac/down/driver"}
{"time":1613990952244,"level":30,"msg":"  ✓ 747.78 MiB needed free space","name":"m/reac/down/driver"}
{"time":1613990952244,"level":30,"msg":"  ✓ 422.66 MiB final disk usage","name":"m/reac/down/driver"}
{"time":1613990952250,"level":30,"msg":"Will use installer unknown","name":"m/reac/down/driver"}
{"time":1613990952254,"level":50,"msg":"No manager for installer unknown\ngithub.com/itchio/butler/cmd/operate.doInstallPerformInner.func1\n\t/builds/itchio/butler/cmd/operate/install_perform.go:266\ngithub.com/itchio/butler/cmd/operate.InstallPrepare\n\t/builds/itchio/butler/cmd/operate/install_prepare.go:264\ngithub.com/itchio/butler/cmd/operate.doInstallPerformInner\n\t/builds/itchio/butler/cmd/operate/install_perform.go:202\ngithub.com/itchio/butler/cmd/operate.doInstallPerform\n\t/builds/itchio/butler/cmd/operate/install_perform.go:137\ngithub.com/itchio/butler/cmd/operate.InstallPerform\n\t/builds/itchio/butler/cmd/operate/install_perform.go:40\ngithub.com/itchio/butler/endpoints/downloads.performOne.func8\n\t/builds/itchio/butler/endpoints/downloads/downloads_drive.go:331\ngithub.com/itchio/butler/endpoints/downloads.performOne\n\t/builds/itchio/butler/endpoints/downloads/downloads_drive.go:336\ngithub.com/itchio/butler/endpoints/downloads.DownloadsDrive\n\t/builds/itchio/butler/endpoints/downloads/downloads_drive.go:76\ngithub.com/itchio/butler/butlerd/messages.(*DownloadsDriveType).Register.func1\n\t/builds/itchio/butler/butlerd/messages/messages.go:2582\ngithub.com/itchio/butler/butlerd.(*Router).HandleRequest.func2\n\t/builds/itchio/butler/butlerd/router.go:306\ngithub.com/itchio/butler/butlerd.(*Router).HandleRequest\n\t/builds/itchio/butler/butlerd/router.go:315\ngithub.com/itchio/butler/butlerd.(*gatedHandler).HandleRequest\n\t/builds/itchio/butler/butlerd/butlerd.go:159\ngithub.com/itchio/butler/butlerd/jsonrpc2.(*connImpl).handleIncomingMessage.func1\n\t/builds/itchio/butler/butlerd/jsonrpc2/jsonrpc2.go:250\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1373","name":"m/reac/down/driver"}
{"time":1613990952254,"level":40,"msg":"Download errored: No manager for installer unknown\ngithub.com/itchio/butler/cmd/operate.doInstallPerformInner.func1\n\t/builds/itchio/butler/cmd/operate/install_perform.go:266\ngithub.com/itchio/butler/cmd/operate.InstallPrepare\n\t/builds/itchio/butler/cmd/operate/install_prepare.go:264\ngithub.com/itchio/butler/cmd/operate.doInstallPerformInner\n\t/builds/itchio/butler/cmd/operate/install_perform.go:202\ngithub.com/itchio/butler/cmd/operate.doInstallPerform\n\t/builds/itchio/butler/cmd/operate/install_perform.go:137\ngithub.com/itchio/butler/cmd/operate.InstallPerform\n\t/builds/itchio/butler/cmd/operate/install_perform.go:40\ngithub.com/itchio/butler/endpoints/downloads.performOne.func8\n\t/builds/itchio/butler/endpoints/downloads/downloads_drive.go:331\ngithub.com/itchio/butler/endpoints/downloads.performOne\n\t/builds/itchio/butler/endpoints/downloads/downloads_drive.go:336\ngithub.com/itchio/butler/endpoints/downloads.DownloadsDrive\n\t/builds/itchio/butler/endpoints/downloads/downloads_drive.go:76\ngithub.com/itchio/butler/butlerd/messages.(*DownloadsDriveType).Register.func1\n\t/builds/itchio/butler/butlerd/messages/messages.go:2582\ngithub.com/itchio/butler/butlerd.(*Router).HandleRequest.func2\n\t/builds/itchio/butler/butlerd/router.go:306\ngithub.com/itchio/butler/butlerd.(*Router).HandleRequest\n\t/builds/itchio/butler/butlerd/router.go:315\ngithub.com/itchio/butler/butlerd.(*gatedHandler).HandleRequest\n\t/builds/itchio/butler/butlerd/butlerd.go:159\ngithub.com/itchio/butler/butlerd/jsonrpc2.(*connImpl).handleIncomingMessage.func1\n\t/builds/itchio/butler/butlerd/jsonrpc2/jsonrpc2.go:250\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1373\ngithub.com/itchio/butler/cmd/operate.InstallPerform\n\t/builds/itchio/butler/cmd/operate/install_perform.go:43\ngithub.com/itchio/butler/endpoints/downloads.performOne.func8\n\t/builds/itchio/butler/endpoints/downloads/downloads_drive.go:331\ngithub.com/itchio/butler/endpoints/downloads.performOne\n\t/builds/itchio/butler/endpoints/downloads/downloads_drive.go:336\ngithub.com/itchio/butler/endpoints/downloads.DownloadsDrive\n\t/builds/itchio/butler/endpoints/downloads/downloads_drive.go:76\ngithub.com/itchio/butler/butlerd/messages.(*DownloadsDriveType).Register.func1\n\t/builds/itchio/butler/butlerd/messages/messages.go:2582\ngithub.com/itchio/butler/butlerd.(*Router).HandleRequest.func2\n\t/builds/itchio/butler/butlerd/router.go:306\ngithub.com/itchio/butler/butlerd.(*Router).HandleRequest\n\t/builds/itchio/butler/butlerd/router.go:315\ngithub.com/itchio/butler/butlerd.(*gatedHandler).HandleRequest\n\t/builds/itchio/butler/butlerd/butlerd.go:159\ngithub.com/itchio/butler/butlerd/jsonrpc2.(*connImpl).handleIncomingMessage.func1\n\t/builds/itchio/butler/butlerd/jsonrpc2/jsonrpc2.go:250\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1373","name":"m/reac/down/driver"}