Perhaps that was running as intended? It stays stuck in the terminal.

Running wolframscript -f Scripts/run.wls gives a lot of terminal output and eventually somewhere near the end gives some url to go to, which you may access through your browser. WLJS seems to work, and WolframKernel seems to start. It should all be working. There should be a URL. If there isn't, then that's interesting.

No, still not working!

Environment: macOS Sonomal 14.2.1 on Mac Studio M1 Max. Wolfram Language 14.0.9 Engine for Mac OS X ARM (64-bit) 14.0.0.

First, I downloaded the archive. I already had wolframscript installed.

After unzipping the archive and moving it to /Applications/wolfram-js-frontend, I invoked Terminal command "wolframscript -f /Applications/wolfram-js-frontend/Scripts/run.wls". After a lot of output beginning with ...

{Assets, .defaultpackages, .editorconfig, Electron, Examples, .gitattributes, .github, .gitignore, imgs, Kernel, LICENSE, package.json, package-lock.json, PacletInfo.wl, public, README.md, Scripts, .scss, Services, .shead, .vscode}
14.0.0 for Mac OS X ARM (64-bit) (November 7, 2023)
MacOSX-ARM64
/Applications/wolfram-js-frontend
>> LPM version: 11
>> LPM >> project directory >> /Applications/wolfram-js-frontend
>> LPM >> fetching paclet infos...
>> LPM >> fetching info by JerryI/CSocketListener on a Github...
>> LPM >> fetching info by KirillBelovTest/Objects on a Github...
>> LPM >> fetching info by KirillBelovTest/Internal on a Github...
>> LPM >> fetching info by KirillBelovTest/TCPServer on a Github...
>> LPM >> fetching info by KirillBelovTest/HTTPHandler on a Github...
>> LPM >> fetching info by KirillBelovTest/WebSocketHandler on a Github...
>> LPM >> fetching info by JerryI/wl-wsp on a Github...
>> LPM >> fetching info by JerryI/wl-misc on a Github...
>> LPM >> checking cached
>> LPM >> fetching a zip archive from the master branch...

the output ended with:

vent-Loop started! 
Connected
asyncsocket id: d5627296-eac3-4c9e-9afd-b6c0a7002289
Started
---print---
>> "Created server with sid: 0"

BinaryWrite::stream: Missing[KeyAbsent, Null][channel] is not a string, SocketObject, InputStream[ ], or OutputStream[ ].
Warning

BinaryWrite::stream: Missing[KeyAbsent, Null][channel] is not a string, SocketObject, InputStream[ ], or OutputStream[ ].
Warning

BinaryWrite::stream: Missing[KeyAbsent, Null][channel] is not a string, SocketObject, InputStream[ ], or OutputStream[ ].

General::stop: Further output of BinaryWrite::stream will be suppressed during this calculation.
Warning
---print---
>> "LPM >> project directory >> \
/Applications/wolfram-js-frontend/Packages/wljs-wlx-support"
---print---
>> "LPM >> fetching paclet infos..."
---print---
>> "LPM >> PASSIVE MODE"

Global`NotebookEventFire::shdw: Symbol NotebookEventFire appears in multiple contexts {Global`, JerryI`WolframJSFrontend`Notebook`}; definitions in context Global` may shadow or be shadowed by other definitions.

And then things froze in Terminal.

Same error