you need to upgrade the contents before you can import into a higher version. Take a look at the cmd bow which will allow you to import.
export the rules in 10.2. Move the xml output over to the 10.4 server and run the cmd there to upgrade the content to 10.4. The import should work then
Just to add to Scott's reply, UpgradeExportedObjects might be the only workaround for this apart from upgrading the entire MRS to the target version.
As Krishnan mentions, best option is executing the command 'infacmd mrs upgradeexportedobjects'.
That command will upgrade the old version XML to your current release.
After that, you will be able to import the upgraded XML into your MRS.
Here you have the complete reference: UpgradeExportedObjects
Hope that helps.
Perform below steps :
1. Take export from previous version.
2. Run "infacmd mrs UpgradeExportedObjects" command to upgrade xml content to latest version in new environment where you want to import the file.
Reference guide : UpgradeExportedObjects
3. Import the file and check if you are able to import the file.
If so please share the error message else raise a case with GCS to look into this issue with more details.
Is your issue solved?