Hi blabberpen,
are you still having trouble with this?
if so here are a few things to try
It generally sounds like your wp-config.php file is missing the multisite directives,
To enable the Network Setup menu item, you must first enable multisite in the wp-config.php file.
Open up wp-config.php
this is what you need to check for. if these two lines are missing than you will not be able to visit the network setup page.
/* Multisite */
define( 'WP_ALLOW_MULTISITE', true );
if they are indeed there then it may be an issues with your “.htccess file”
if they are not there than add it to the file above where it says:
/* That's all, stop editing! Happy blogging. *
so firstly check to make sure that
define( 'WP_ALLOW_MULTISITE', true );
is present in this file. if not add it as described above.
let me know how it goes if you still need help
there is an updated fork of this plugin here by a different developer who says they will support it going forward:
https://bitbucket.org/Nate_D/database-to-excel
there is an updated fork of this plugin here:
https://bitbucket.org/Nate_D/database-to-excel