Please be sure you saved the file with the same name or even go to Applications \ EndNote \ Filters and delete the current EndNote Import filter.
You can then do the same steps to download the file.
If that does not resolve the issue then please contact Technical Support directly.
1-800-336-4474 option 4 then 1
or
https://support.clarivate.com/Endnote/s/technicalsupport?language=en_US