I'm the creator of the post you referenced. I'm sorry that I can't help you any further as I swore off all iDevices when my Classic got filled up. But I do have a few questions:
Have you met the first two requirements?
Requirements
1 - You must use iTunes 9.2.1 available from http://www.oldapps.com/itunes.php.
2 - Your Classic must be at firmware 2.0.4, which is/was the original firmware for the Classic 6th Generation series.
And if so, perhaps try MB (Portable) v3.1 as that was the current version when I wrote the post. You can PM me and I'll upload 3.1 Portable Final to MediaFire or some other hosting site.. Old Versions post:
https://getmusicbee.com/forum/index.php?topic=29783.0Please let me know if it works so I can edit the original post.
If it doesn't work, perhaps there is someone out there who can provide an answer for you.