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Please follow the steps to install the Issue Checklist app in Jira Cloud:

Go to your Apps > Find new apps,
Type Issue Checklist in the search field, and
Click the selected checklist entry - it should show a popup or a page with the Try Free button (for a paid app) or Get app button (for a free app).

Please see the screenshot below for reference.

Find:

Issue Checklist Documentation (Legacy) > Install Issue Checklist app > image2020-12-31_11-55-50.png

Install (Pro or Free):

Issue Checklist Documentation (Legacy) > Install Issue Checklist app > image2020-12-31_12-1-13.png