Like all add-ons in Atlassian Marketplace, Issue History is set in two ways:
from Atlassian Marketplace;
from Jira admin page.
If you want to install the add-on from Atlassian Marketplace, please follow the steps listed below:
1. Type "Issue History saasjet" in "Search the Marketplace" field.
2. Find the add-on "Issue History" by SaaSJet at the search results.
3. Press the "Try it free" or "Subscribe Buy now" button.
4. Select "saasjet (https://saasjet.atlassian.net)" to install the add-on, then click "Start free trial"
5. You're all set!
If you want to install the add-on from Jira admin page, please follow the instructions below. (You need to be a JIRA Administrator in order to install Issue History)
1. First, click on "Jira Settings" and then choose "Apps".
2. Go there to "Find new add-ons" page.
3. Type "Issue History" by SaaSJet in the search box and then click on it.
4. Click "Free trial" or "Subscribe now" to download and install the app.
5. You're all set!