How to upgrade Plugin In Jira?

nstalling within Jira (Recommended)
It is recommended to install the Jira Misc Workflow Extensions add-on from the Find new add-ons page within your Jira instance.

To install the add-on, follow these steps:

Log in to Jira as an administrator.
Go to the Administration icon and click on it.
Locate Add-ons from the menu and click on it. Validate your credentials if needed.
Click on Find new add-ons and locate Jira Misc Workflow Extensions via search.
Buy or evaluate the add-on with a free 30-day trial.
A license gets generated and you are to ready to go! For information on configuring of the license, see Configuring License.

You have installed the Jira Misc Workflow Extensions add-on. To verify that the installation was successful, see Post-Installation.

Installing from the Atlassian Marketplace
To install, follow these steps:

Go to the Atlassian Marketplace page for Jira Misc Workflow Extensions and select Server from the drop-down at the right.
Buy or evaluate the add-on with a free 30-day trial.

Enter the details on the New evaluation screen and generate a license.
Download the jar file. Now, log in to Jira as an administrator.
Go to the Administration icon and click on it.
Locate Add-ons from the menu and click on it.
Click on Manage add-ons.
Click on and upload the jar file.
To configure the license, see Configuring License.

You have installed the JIRA Misc Workflow Extensions add-on. To verify that the installation was successful, see Post-Installation.

Installing a SNAPSHOT (test) version
Our Support team might provide you with a test version of the add-on, through a link posted in a response to a support request.

To install it, follow these steps:

Log in to Jira as an administrator.
Go to the Administration icon and click on it.
Locate Add-ons from the menu and click on it.
Click on Manage add-ons.
Click on and upload the jar file.
You have now uploaded the new version of the Jira Misc Workflow Extensions add-on. To verify that the installation was successful, see Post-Installation.

Once the final version of the add-on is released, you will need to uninstall the add-on and re-install it from Find new add-ons. If you don't, Jira will stop offering upgrades to newer versions. For more information, see Installing within Jira.

Configuring the License
The license key is automatically configured into the add-on configuration for free trial licenses as well as licenses purchased using the Buy button on the Manage Add-ons page.

For licenses purchased on the Atlassian Marketplace website, follow these steps:

In Jira go to the Administration icon and click on it.
Locate Add-ons from the menu and click on it.
Click on Manage Add-ons and locate Jira Misc Workflow Extensions via search.
Click on icon in the License key field. To know how to locate your license key see, Locate and Update License.
Enter the purchased license in License key and click on Update.