It's quite strange that you are currently running 1.1.2, since it is not currently available on our marketplace. The best way to upgrade this plugin is to upload it manually.
First you would need to download the jar file (the latest is v. 1.2.5): https://marketplace.atlassian.com/download/plugins/com.atlassian.jira.collector.plugin.jira-issue-collector-plugin/version/37
Then, depending on your JIRA version, manage the addon via Administration > Plugins > Manage Add Ons/Plugin and look for the link Upload Plugin or Upload Addon. For more info on uploading a jar file, you can refer to this documentation: https://confluence.atlassian.com/display/UPM/Installing+Add-ons#InstallingAdd-ons-Installingbyfileupload
Hope this helps.
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