Before proceeding, it is recommended you make a complete backup of at least the webroot of FocusOPEN as well as a database backup and verify that your scheduled asset file backup is up to date.
If you have problems with the web.config folder, use the one from the deployment package and edit this to suit any localised configuration changes.
The APS (Asset Processing Server) has been made more robust in 3.3.7 so you are advised to re-install the APS from the Installers folder in the deployment package.