Exception while Pre-caching engine

[FMorschel]

No matter what I try, for stable beta or master, and for both Windows and Linux, I see this:

[E] Exception while Pre-caching engine
[E] HttpException: Error 404 from https://raw.githubusercontent.com/flutter/flutter/ca1580b01385830a08e240520520671484a8401e/bin/internal/engine.version:
    404: Not Found
    #0      HttpException.ensureSuccess (package:puro/src/http.dart:191)
    #1      getEngineVersionOfCommit (package:puro/src/env/create.dart:178)
    <asynchronous suspension>
    #2      createEnvironment.<anonymous closure>.<anonymous closure> (package:puro/src/env/create.dart:266)
    <asynchronous suspension>
    #3      runOptional (package:puro/src/logger.dart:172)
    <asynchronous suspension>
[✓] Created new environment at `/home/fmorschel/.puro/envs/master/flutter`

@pingbird