On a 5.4.2, when trying to use ezpm.php install command form ezpublish installation root, by manually defining my db connection settings:

sudo php ezpublish/console ezpublish:legacy:script --siteaccess=ezdemo_site_admin ezpm.php --debug=all --db-user=ezp --db-password=ezp --db-host=localhost --db-type=mysql --db-name=ezp54 install test_package

I get this error:

Running script 'ezpm.php' in eZ Publish legacy context
Version '5.4.0' in database 'ezp54' is different from the running version 5.4.2

It appears the problem might somewhat be related to the fact that in ezpublish_legacy/ezpm.php, line 722, I have:

"SELECT * FROM ezsite_data WHERE name = 'ezpublish-version'"

and on my database I have:

select * from ezsite_data;

+-------------------+-------+
| name              | value |
+-------------------+-------+
| ezdemo            | 2.0   |
| ezpublish-release | 1     |
| ezpublish-version | 5.4.0 |
+-------------------+-------+
3 rows in set (0.00 sec)

I have 5.4.0 in the DB and my ezpublish version is 5.4.2.
I have a package ezpublish/ezpublish_legacy/tmp/package test_package-1.0-1.ezpkg for the test.