For your current issue, unzip the export and try again.

In general I do want to note that Jfrog do not recommend importing from one version to another version, though it can work, so you can test it out.

See the warning here:

We do not recommend that you import and export between different versions of Artifactory.

(Instead it is recommended to import to same version then upgrade that system. But It is fine to test what you are doing as it can work also.