OK, so I went ahead and tried to install this. I am now having the same error as 'cartguin' above, which is:
Code:
Fatal error: Call to undefined method yclass::init_template() in /home/user2000/public_html/zencart/admin/module_manager.php on line 14
First, I installed the latest version of module manager (module_manager_rev15.zip) according to instructions. That went fine, when I went to Tools > Module Manager, it showed that it was properly installed.

So then I have carefully installed the latest version of cross sell advanced (cross_sell_advanced_rev185.zip), and when I go to the Module Manager, I get the above fatal error.

Question: when it says to renamed the files i.e.:
Code:
2. Make sure to change the name of the following directories (from the ZIP) to match your template name:
    /includes/modules/YOUR_TEMPLATE 
    /includes/templates/YOUR_TEMPLATE 
    /includes/languages/english/YOUR_TEMPLATE
...does it mean to match the name to the current template's folder's name? In other words, my template lives inside a folder named:

/includes/templates/theme033

So I would named the above folders to (before uploading)?:
Code:
    /includes/modules/theme033 
    /includes/templates/theme033 
    /includes/languages/english/theme033
That is what I have done, anyway, it's not working. Any help would be greatly appreciated!