the reason why I opened this forum is because the response time was so slow.
I'm really sorry to hear that honest. But it's really important that plugin or theme authors do not use these free forums to support their paid customers.
When those authors do use these forums for that support that's not fair to the customer (that'd be you in this case) and it's not fair to the other authors who are playing by the rules.
As it's been said before: commercial products are not supported in these forums.
This plugin is an odd case and I am not sure exactly what you are paying for when you make a purchase from this author. Hopefully they'll chime in.
Again I'm really sorry that you are in this position and are having these problems.
Apparently the reason why it is not working is because I am using "multi-site mode with sub-directories" and I need to change that.
I would hold off on making a change like that. Switching your installation from one type of multisite to another is a huge architectural change and should not be done lightly. Especially if there are other sites in your network and you want to keep those working.
Short version: if you make that change it might break your multisite installation and I'm not sure how to fix it after that. I do want you to have that slider working but I also do not want make your situation worse or even more complicated.
Let's see if the plugin author replies. As I understand it a multisite sub-directory installation shouldn't look much different than installing WordPress in a sub-directory from a plugin point of view. But I don't use that plugin so I may be unaware of what the issues are.