diff -Naur a/lib/private/Updater.php b/lib/private/Updater.php
--- a/lib/private/Updater.php	2020-10-24 10:37:44.000000000 +0200
+++ b/lib/private/Updater.php	2020-11-10 10:51:10.511861549 +0100
@@ -197,14 +197,11 @@
 		}
 
 		if ($currentVendor === 'nextcloud') {
-			return isset($allowedPreviousVersions[$currentVendor][$majorMinor])
-				&& (version_compare($oldVersion, $newVersion, '<=') ||
-					$this->config->getSystemValue('debug', false));
+			return true;
 		}
 
 		// Check if the instance can be migrated
-		return isset($allowedPreviousVersions[$currentVendor][$majorMinor]) ||
-			isset($allowedPreviousVersions[$currentVendor][$oldVersion]);
+		return true;
 	}
 
 	/**