Administration → Upgrade Wizard.
System check:
File Permissions: All Files Writable|
Database Privileges: All Privileges Available
Detected Settings: All System Settings Requirements Satisfied
Upload upgrade package: SuiteCRM-Upgrade-7.12.x-to-7.13.0.zip → Upload package
→ The zip file is missing a manifest.php file. Cannot proceed.
manifest.php -file is in the package, written with all small letters.