We use TestFlight to install and update our App on your iPhone. You need to keep TestFlight installed if you want to use the SPINSIGHT App.
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If you uninstalled TestFlight you can install TestFlight again. Usually it remembers our App and you are able to install and update the SPINSIGHT App.
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If the SPINSIGHT App is not listed in TestFlight you may need to rejoin via public link. Please try the Link you got in the E-Mail after you bought the Starter Kit. If that does not work, contact us via info@spinsight.com and provide the name of the person who bought the Starter Kit.