https://www.oracle.com/java/technologies/javase/jdk14-archive-downloads.html
可以下载，可能你的账号有过商业行为，换个账号试试

The new Oracle Technology Network License Agreement for Oracle Java SE is substantially different from prior Oracle JDK licenses. The new license permits certain uses, such as personal use and development use, at no cost – but other uses authorized under prior Oracle JDK licenses may no longer be available. Please review the terms carefully before downloading and using this product.

官网我只看到 8，11，16，17。

https://www.oracle.com/java/technologies/downloads/#java16

你的是不是一个假的oracle官网，下载链接放出来看下。