It looks like the standard postinstall script stacks are hard-coded using Unix-style paths. On Unix, ./somethig/or/another means access to the something directory starting HERE (value . ).
I would suggest posting an error on their GitHub page to get started. Then you can get away with editing package.json so that the post post script uses Windows style paths. It will be something like node_modules\bower\bin\bower install . I have no windows, so I canβt say for sure.
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