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After clicking Fetch License, your license file will be downloaded from Periscope servers, copied into the appropriate directory, and loaded. You should now be able to access Periscope through a browser at http://{IP_of_host}/api/{proj}/ext/periscope. Where "{proj}" is the name of the SkySpark project the extension was enabled for previously (without the open and closing brackets). Contact licenses@activelogix.com if you run into any issues obtaining or loading your license.
If enabled for the demo project the URL would be:
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