hi i have same problem i want to remove 2.20 and install 2.80

how to upgrade 2.20 to 2.80
give error how to remove old license

/bin/sh: line 9: server/fop2_server: Permission denied

Upgrade Aborted. License reactivation failed.

Be sure you have internet access from this server,
and that your code is not older than a year.

If your license has expired, you must renew it in order to upgrade,
or you can still use your current FOP2 version for as long as you want.

If you already bought an upgrade code please run the following command:

server/fop2_server --upgrade

If the upgrade is successful run make again to retry the installation.