diff --git a/chrome/content/zotero/xpcom/db.js b/chrome/content/zotero/xpcom/db.js
index d7eafc064..993d28c4c 100644
--- a/chrome/content/zotero/xpcom/db.js
+++ b/chrome/content/zotero/xpcom/db.js
@@ -1298,3 +1298,9 @@ Zotero.DBConnection.prototype._getTypedValue = function (statement, i) {
 
 // Initialize main database connection
 Zotero.DB = new Zotero.DBConnection('zotero');
+
+Zotero.DB.IncompatibleVersionException = function (msg, dbClientVersion) {
+	this.message = msg;
+	this.dbClientVersion = dbClientVersion;
+}
+Zotero.DB.IncompatibleVersionException.prototype = Object.create(Error.prototype);
diff --git a/chrome/content/zotero/xpcom/schema.js b/chrome/content/zotero/xpcom/schema.js
index 71ea7ad84..11482d7b4 100644
--- a/chrome/content/zotero/xpcom/schema.js
+++ b/chrome/content/zotero/xpcom/schema.js
@@ -1554,8 +1554,12 @@ Zotero.Schema = new function(){
 			return true;
 		}
 		
-		throw ("Zotero '" + schema + "' DB version (" + dbVersion
-			+ ") is newer than SQL file (" + schemaVersion + ")");
+		let dbClientVersion = Zotero.DB.valueQuery(
+			"SELECT value FROM settings WHERE setting='client' AND key='lastCompatibleVersion'"
+		);
+		let msg = "Database is incompatible with this Zotero version "
+			+ `(${schema}: ${schemaVersion} > ${dbVersion})`
+		throw new Zotero.DB.IncompatibleVersionException(msg, dbClientVersion);
 	}
 	
 	
@@ -1937,8 +1941,12 @@ Zotero.Schema = new function(){
 			return false;
 		}
 		else if (fromVersion > toVersion) {
-			throw new Error("Zotero user data DB version is newer than SQL file "
-				+ "(" + toVersion + " < " + fromVersion + ")");
+			let dbClientVersion = Zotero.DB.valueQuery(
+				"SELECT value FROM settings WHERE setting='client' AND key='lastCompatibleVersion'"
+			);
+			let msg = "Database is incompatible with this Zotero version "
+				+ `(user data: ${fromVersion} > ${toVersion})`
+			throw new Zotero.DB.IncompatibleVersionException(msg, dbClientVersion);
 		}
 		
 		Zotero.debug('Updating user data tables from version ' + fromVersion + ' to ' + toVersion);
diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index 191729ae2..c6d257665 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -610,20 +610,23 @@ Components.utils.import("resource://gre/modules/Services.jsm");
 				var updated = Zotero.Schema.updateSchema();
 			}
 			catch (e) {
-				if (e.toString().match('newer than SQL file')) {
-					let versions = e.toString().match(/\((\d+) < (\d+)\)/);
+				if (e instanceof Zotero.DB.IncompatibleVersionException) {
 					let kbURL = "https://www.zotero.org/support/kb/newer_db_version";
-					let msg = Zotero.getString('startupError.zoteroVersionIsOlder') + " "
-						+ Zotero.getString('startupError.zoteroVersionIsOlder.upgrade') + "\n\n"
+					let msg = (e.dbClientVersion
+						? Zotero.getString('startupError.incompatibleDBVersion',
+							[Zotero.clientName, e.dbClientVersion])
+						: Zotero.getString('startupError.zoteroVersionIsOlder')) + "\n\n"
 						+ Zotero.getString('startupError.zoteroVersionIsOlder.current', Zotero.version)
-						+ (versions ? " (" + versions[1] + " < " + versions[2] + ")" : "") + "\n\n"
-						+ Zotero.getString('general.seeForMoreInformation', kbURL);
+							+ "\n\n"
+						+ Zotero.getString('startupError.zoteroVersionIsOlder.upgrade',
+							ZOTERO_CONFIG.DOMAIN_NAME);
 					Zotero.startupError = msg;
 					_startupErrorHandler = function() {
 						var ps = Components.classes["@mozilla.org/embedcomp/prompt-service;1"]
 							.getService(Components.interfaces.nsIPromptService);
 						var buttonFlags = (ps.BUTTON_POS_0) * (ps.BUTTON_TITLE_IS_STRING)
 							+ (ps.BUTTON_POS_1) * (ps.BUTTON_TITLE_CANCEL)
+							+ (ps.BUTTON_POS_2) * (ps.BUTTON_TITLE_IS_STRING)
 							+ ps.BUTTON_POS_0_DEFAULT;
 						
 						var index = ps.confirmEx(
@@ -632,10 +635,13 @@ Components.utils.import("resource://gre/modules/Services.jsm");
 							Zotero.startupError,
 							buttonFlags,
 							Zotero.getString('general.checkForUpdate'),
-							null, null, null, {}
+							null,
+							Zotero.getString('general.moreInformation'),
+							null,
+							{}
 						);
 						
-						// "Check for updates" button
+						// "Check for Update" button
 						if(index === 0) {
 							if(Zotero.isStandalone) {
 								Components.classes["@mozilla.org/embedcomp/window-watcher;1"]
@@ -680,6 +686,17 @@ Components.utils.import("resource://gre/modules/Services.jsm");
 								);
 							}
 						}
+						// Load More Info page
+						else if (index == 2) {
+							let io = Components.classes['@mozilla.org/network/io-service;1']
+							.getService(Components.interfaces.nsIIOService);
+							let uri = io.newURI(kbURL, null, null);
+							let handler = Components.classes['@mozilla.org/uriloader/external-protocol-service;1']
+							.getService(Components.interfaces.nsIExternalProtocolService)
+							.getProtocolHandlerInfo('http');
+							handler.preferredAction = Components.interfaces.nsIHandlerInfo.useSystemDefault;
+							handler.launchWithURI(uri, null);
+						}
 					};
 				}
 				else {
diff --git a/chrome/locale/en-US/zotero/zotero.properties b/chrome/locale/en-US/zotero/zotero.properties
index fae17e946..a9311ccc1 100644
--- a/chrome/locale/en-US/zotero/zotero.properties
+++ b/chrome/locale/en-US/zotero/zotero.properties
@@ -133,8 +133,9 @@ startupError.closeFirefox					= If Firefox with the Zotero extension is open, pl
 startupError.databaseCannotBeOpened			= The Zotero database cannot be opened.
 startupError.checkPermissions 				= Make sure you have read and write permissions for all files in the Zotero data directory.
 startupError.zoteroVersionIsOlder			= This version of Zotero is older than the version last used with your database.
-startupError.zoteroVersionIsOlder.upgrade	= Please upgrade to the latest version from zotero.org.
+startupError.incompatibleDBVersion         = This %1$S database requires %1$S %2$S or later.
 startupError.zoteroVersionIsOlder.current	= Current version: %S
+startupError.zoteroVersionIsOlder.upgrade      = Please upgrade to the latest version from %S.
 startupError.databaseUpgradeError			= Database upgrade error
 
 date.relative.secondsAgo.one			= 1 second ago
diff --git a/resource/config.js b/resource/config.js
index cc147308c..552195b61 100644
--- a/resource/config.js
+++ b/resource/config.js
@@ -1,6 +1,7 @@
 var ZOTERO_CONFIG = {
 	GUID: 'zotero@chnm.gmu.edu',
 	CLIENT_NAME: 'Zotero',
+	DOMAIN_NAME: 'zotero.org',
 	REPOSITORY_URL: 'https://repo.zotero.org/repo/',
 	REPOSITORY_CHECK_INTERVAL: 86400, // 24 hours
 	REPOSITORY_RETRY_INTERVAL: 3600, // 1 hour