When upgrading track changes on V2, redirect to V1 trial page

services/web/app/views/layout.pug

@@ -96,6 +96,10 @@ html(itemscope, itemtype='http://schema.org/Product')
 					indexName : '!{settings.templates.indexName}'
 				}
 
+		- if (settings.overleaf && settings.overleaf.host)
+			script.
+				window.v1BaseUrl = '!{settings.overleaf.host}'
+				
 	body
 		if(settings.recaptcha)
 			script(src="https://www.google.com/recaptcha/api.js?render=explicit")

services/web/public/coffee/main/account-upgrade.coffee

@@ -11,6 +11,9 @@ define [
 			w = window.open()
 			go = () ->
 				ga?('send', 'event', 'subscription-funnel', 'upgraded-free-trial', source)
+				if window.v1BaseUrl?
+					url = "#{window.v1BaseUrl}/users/trial"
+				else
 					url = "/user/subscription/new?planCode=#{plan}&ssp=true"
 					if couponCode?
 						url = "#{url}&cc=#{couponCode}"