the error you are seeing "We ran into a little trouble. It might just be a hiccup. Try again in a bit." can be triggered after a migration if the imported groups have not been granted access to any default groups for product access.
To check if this is the case, navigate to Administration >> SITE SETTINGS >> Product Access, and you will see a yellow banner at the top of the page
Hope this helps,
Can you please create a ticket for this in our Tempo Support channel, https://tempo-io.atlassian.net/servicedesk/customer/portal/6, so we can better assist you
Sorry to hear about this problem. There was a problem with Atlassian Cloud sites being unable to install 3rd party apps yesterday (4-March). This is detailed in https://jira-core.status.atlassian.com/incidents/pkb2zv9xxhn2
I am not certain if this is the same problem you are experiencing here, but given the nature of your error, it feels like it might be possibly related. I am not certain if the time this incident was happening is correctly lining up with the time you saw this problem. The good news is that this particular incident has been resolved. So if this was the problem you should be able to install that app now. If this is not working, then certainly reaching out to the plugin vendor could be useful means to troubleshoot this.
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