Hi,

are there database tables or files I need to remove or empty manually as well?

Yes, you need to remove following tables:
- #__jsn_users
- #__jsn_fields

Also to clear configuration you need to delete record in table #__extensions with name='com_jsn'

Here the queries

DROP TABLE prefix_jsn_users;

DROP TABLE prefix_jsn_fields;

DELETE FROM prefix_extensions WHERE name = 'com_jsn';

replace prefix with your Joomla prefix table

Thank you for the prompt response...but

I removed Easy Profile using Extensions -> Manage . searching for 'Easy' and selected then Uninstalling the items listed. I then ran your query and attemped to install the basic package Extensions -> Manage -> Install -> Upload Package and got the following error:

JInstaller: :Install: Can't find XML setup file.

JInstaller: :Install: Can't find XML setup file.

JInstaller: :Install: Can't find XML setup file.

JInstaller: :Install: Can't find XML setup file.

JInstaller: :Install: Can't find XML setup file.

JInstaller: :Install: Can't find XML setup file.

Table 'joomladb.jml_jsn_fields' doesn't exist SQL=ALTER TABLE `jml_jsn_fields` ADD `edit` tinyint(1) NOT NULL DEFAULT '0';

Package Update: There was an error installing an extension: jsn.zip

What am doing wrong ?

Hi,.
try to follow these steps:
- Install Free version attached to this post
- After install your Basic version

Alternative:
post me your site details, we will install for you , you can use the form below the reply in "Site Details" tab to keep private your infos