If there is a new version of an application installed in Installatron, you can upgrade to the latest one.
If an application is up to date, a green check will be displayed next to the version like shown here.

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If there's a newer version, a button will be displayed.
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1) Click the button to begin.
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2) Click Next.

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Here we can see the latest version and the current version. You can select an earlier version to upgrade to, but it's recommended that you upgrade to the latest.
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3) Click Next.

4) Select whether or not to create a backup in case something breaks during upgrading.

5) Click Next.

6) Click Submit.

7) Click Complete.

8) Click this link to view our newly upgraded application.

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Everything appears to have upgraded correctly.

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That's it! You now know how to upgrade an application in Installatron.