Error when Installing metacello

>
> Hi,
>
> I CTRL + d the following from the metacello githhub readme in a workspace of a fresh download of squeak on Windows 10.
>
> "Get the Metacello configuration (for Squeak users)"
> Installer gemsource
>     project: 'metacello';
>     addPackage: 'ConfigurationOfMetacello';
>     install.
>
> "Bootstrap Metacello Preview, using mcz files (#'previewBootstrap' symbolic version"
> ((Smalltalk at: #ConfigurationOfMetacello) project
>   version: #'previewBootstrap') load.
>
> "Load the Preview version of Metacello from GitHub"
> (Smalltalk at: #Metacello) new
>   configuration: 'MetacelloPreview';
>   version: #stable;
>   repository: 'github://Metacello/metacello:configuration';
>   load.
>
> "Now load latest version of Metacello"
> (Smalltalk at: #Metacello) new
>   baseline: 'Metacello';
>   repository: 'github://Metacello/metacello:master/repository';
>   get.
> (Smalltalk at: #Metacello) new
>   baseline: 'Metacello';
>   repository: 'github://Metacello/metacello:master/repository';
>   load.
>
>
> But it errors with:
> Could not resolve: ConfigurationOfMetacelloPreview [ConfigurationOfMetacelloPreview] in c:\smalltalk\squeak\package-cache github://Metacello/metacello:configuration ERROR: 'GoferRepositoryError: can''t find EOCD position.
>
> What do I need to do? Ultimately I want to get Seaside but, apparently I need this first.
>
> Thank you.
>
> Holly.
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