How to open a Endnote X9 compressed file in Endnote X8?

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Please see the following Knowledge Base article on this issue.

https://support.clarivate.com/Endnote/s/article/EndNote-X9-3-Library-Conversion-and-Backward-Compatibility?language=en_US

You will need the EndNote X9 user send the library to you another for you to be able to use it with EndNote X8.

You can contact Technical Support for assistance.

1-800-336-4474 option 4 then 1

or
https://endnote.com/contact/