Installing app

Atlassian’s document describes how to install apps, including Excel-like Tables for Jira:

• Manage apps (Jira Cloud)

See Find and add new apps section for the details.

You can also add it from Atlassian Marketplace. Go to marketplace.atlassian.com and search Excel-like Tables for Jira. You will find Try it free button at the upper-right corner.

Atlassian Marketplace: Excel-like Tables for Jira (Sheet Import & Export) | Atlassian Marketplace

Product page: Excel-like Tables for Jira