原文

This package has been deprecated from the Asset Store.
This means that new purchases of the package are not allowed and that only users
who already purchased or downloaded the package before it was deprecated, are allowed to download it.

In most cases,
package deprecation happens because the publisher is unable or unwilling to support the package anymore.
We suggest looking for alternative packages or contacting the publisher directly.

If you’ve already purchased it and need to download a copy, you can do so here.

意訳すると
「もう非公開になったので、既に買っている人しか使えませんよ」
って感じかな
全然意味違うなｗ