Hello Mr Gogoli,
there are(should be) many ways to install the add-on. On the add-on administration site within your JIRA you can search for sumUp and than click the install button (if not already installed). You can also download the file from https://marketplace.atlassian.com/plugins/com.atlassian.cps.sumUp/versions and afterwards click on the upload add-on button at the manage add-ons site.
Find new add-on site with installed sumUp:
Manage add-ons site with installed sumUp:
There you can also find the upload add-on button.
What is different in your instance?
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