JIRA-XL client version must match with plugin version which installed in JIRA.
Please refer Supported Platform for Microsoft Excel compatibility list.
- Goto https://marketplace.atlassian.com/plugins/com.unlimax.jira.plugin.jira-xl download Server side plugin and get evaluation license.
- Download attachment at bottom of this page.
- Refer to Installation for install server side plugin in JIRA and config client.