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The procedure is very simple:
Go to your Confluence https://[your-account].atlassian.net/wiki/home
Choose
AppsยปManage appsfrom the upper menuFind
Smart Jira Issue for Confluence LITEand expand itPress
Uninstallbutton and follow the instructionsThen, click the
Appsdropdown again and chooseFind new appsSearch for
Smart issue view for Confluenceand click on the app tileClick
Try it freeto start installing your app