MEGAMAC review for Google & YouTube

Was advised in the email from Shopify to upgrade to this channel as the Google Shopping channel will be closed on October 21. First you have to delete your old Google Shopping App - no chance of getting that back. Tried to install the new Google Shopping Channel, doesn't work, has given me a message "Updating your Merchant Center account..." for the past 24 hours. Shopify support unhelpful - told me to delete and re-install. Did not work. Now I have no Google Shopping feed for my google shopping ads, leading to a drop in sales. What a disaster! Thanks Shopify!