Do you support Zend Optimizer?

No. Zend Optimizer isn’t available. It only ever worked with very old PHP versions (5.2 and earlier) and is no longer maintained.

What to use instead

• For speed: PHP’s built-in OPcache does what Zend Optimizer used to do, and more. See Enabling PHP opcode caching.
• For encoded (protected) applications: ionCube Loader and SourceGuardian are available as PHP extensions in cPanel → Select PHP Version → Extensions. See Do you support ionCube PHP Encoder? and Do you support SourceGuardian?.
• Zend Guard Loader (the successor to Zend Optimizer) is available only with PHP 5.3, which is long out of support. Ask the application’s vendor for a version that works with current PHP.

Not sure what your application needs? Open a support ticket with the application name and the PHP version it asks for.