Woolerina review for Retail Barcode Labels

We are no longer able to access the Retail Barcode Label App - we are getting a message that the IP address is not recognised. Have tried deleting the app & re-installing it, however when we try to re-install it, it also shows a message that the IP address is not recognised. I have emailed the support email address without response. I am very disappointed by this & it is affecting our ability to run our business.