I have a valid license till May 2021, need to install on a server previously having older version

Question

* I tried install Jira on a server which previously had an older version which had expired.
* When I install I get the below  message :
License Too Old For Build: We found a problem with your JIRA license
* I then clicked on the link which takes me to a new page where I can enter my new license details.
* My questions are related to this page where I need to enter an admin user name, admin password and new license.* I have the license key (I can copy and paste the new license key, no problem)
* I don't know which admin user name to use ? * I keep getting a message that the user name is incorrect.
I'm guessing its asking me for the admin user name of the older installation. How can I delete the older installation completely so that it stops asking me the admin user name of an installation which expired long time back.
-- Can I start fresh ? I have a new valid license and I don't remember the very old username of the expired installation.

Chetan Handa · Answer

Thanks that worked.
New instance is working, I just had to get rid of the older folder.

Daniel Ebers · Answer

If I understood you correctly there were some issues with the license and for easier handling you decided to wipe the existing installation - because the data is not needed anymore and you want to start fresh.

If so, you would just need to delete jira (installation directory) along with jira_home (home directory). Additionally you would need to delete the database.

Then a new installation with the license key you said it would be valid until 2021 is needed.

https://confluence.atlassian.com/adminjiraserver/installing-jira-applications-938846823.html

Chetan Handa · Answer

Yes, the older data is of no use, it just had some test data. 
I'd like to start fresh.