Migrating Issue Links Viewer
Issue links viewer is a static app which doesn’t affect created issues, does not store any data.
If you migrate from Server (Data Center) to Cloud → just install app, it works out of the box.
The only difference in Jira Cloud is related to the fact that there are 2 issue views available. In new view app needs to be ‘activated’ on that view per user.
Feel free to tell us what topic should be covered: issuelinksviewer@psc-software.atlassian.net