If the umbracoMigration table does not yet exist, then get the configured version from the web.config and parse it

src/Umbraco.Web/Install/InstallSteps/UpgradeStep.cs

@@ -1,3 +1,5 @@
+using System;
+using System.Linq;
 using Semver;
 using Umbraco.Core;
 using Umbraco.Core.Configuration;
@@ -52,12 +54,35 @@ namespace Umbraco.Web.Install.InstallSteps
 
             //If we have a db context available, if we don't then we are not installed anyways
             if (ApplicationContext.Current.DatabaseContext.IsDatabaseConfigured && ApplicationContext.Current.DatabaseContext.CanConnect)
-            {
                 version = ApplicationContext.Current.DatabaseContext.ValidateDatabaseSchema().DetermineInstalledVersionByMigrations(ApplicationContext.Current.Services.MigrationEntryService);
+
+            if (version != new SemVersion(0))
+                return version;
+
+            // If we aren't able to get a result from the umbracoMigrations table then use the version in web.config, if it's available
+            if (string.IsNullOrWhiteSpace(GlobalSettings.ConfigurationStatus))
+                return version;
+
+            var configuredVersion = GlobalSettings.ConfigurationStatus;
+
+            string currentComment = null;
+
+            var current = configuredVersion.Split('-');
+            if (current.Length > 1)
+                currentComment = current[1];
+
+            Version currentVersion;
+            if (Version.TryParse(current[0], out currentVersion))
+            {
+                version = new SemVersion(
+                    currentVersion.Major,
+                    currentVersion.Minor,
+                    currentVersion.Build,
+                    string.IsNullOrWhiteSpace(currentComment) ? null : currentComment,
+                    currentVersion.Revision > 0 ? currentVersion.Revision.ToString() : null);
             }
 
             return version;
         }
-        
     }
 }