Hello,
After updating to Modeler 0.8.8 on macOS arm64, opening any .sysml file shows a “Downloading Syside Tools” progress notification that never resolves. No error surfaces to the user, no features are available, and there is no visible indication of what went wrong.
The underlying failure (visible only in the extension log) is a repeated 404 when pre-release is enabled:
[info] Downloading Syside tools (proxy mode: Auto)
[info] Status from https://raw.pkg.keygen.sh/.../@syside-modeler-dependencies-pre-release/0.8.8/dependencies-ts-darwin-arm64.zip: 404 Not Found
[info] JSON response: {"errors":[{"title":"Not found","detail":"The requested release artifact 'dependencies-ts-darwin-arm64.zip' was not found","code":"NOT_FOUND"}]}
[info] Install Syside Tools response: "failure"
Fix (in settings.json):
"syside.modeler.usePreReleaseToolsChannel": false
Reload window → extension downloads cleanly from the stable channel.
My guess: the pre-release dependency bundle, atl east for macOS arm64 v0.8.8 doesn’t appear to be published in Keygen’s release index, so the extension 404s on every attempt when the pre-release channel is enabled. The stable channel has the artifact.
I think this is worth flagging because the failure is invisible from the UI — users on pre-release + macOS arm64 would likely just conclude the extension is broken, without any signal pointing at the channel setting.