eBay LINK connects best with stores that have a base currency of Australian, New Zealand, American, Euro, British Pound and Canadian dollars . 

If you are trying to install the app and your store currency is set to any currency that is not AUD, NZD, USD, CAD, EUR or GBP you will not be able to install the app.

Note: eBay LINK only connects to www.ebay.com.au - the Australian eBay site.