Add FAQ for module upgrades

Author: fisharebest

faq/upgrade-modules.md

@@ -0,0 +1,22 @@
+---
+layout: page
+title: FAQ - Upgrade modules
+date: 2024-12-29
+---
+
+There are many [third-party modules]({% link download/modules.md %})
+available for webtrees.
+
+In general, these modules only work with specific versions of webtrees.
+Sometimes there are changes to the core code and the module needs updating
+to work with the new version.
+
+When a new version of webtrees is available, you should check your modules’
+websites to see if they are compatible with the new version.  You may need
+to wait a few days or weeks for the module author to verify that it works
+with the latest version, or update it.
+
+If you have upgraded webtrees without checking/upgrading your modules,
+your site may show fatal errors.  To recover from this you will need
+to disable the modules that cause errors.  To do this, rename the
+folder from `modules-v4/xxx` to `modules-v4/xxx.disabled`.