So it's working, just can't be installed. Bizarre that this is possible. Looks like it's not a simple solution and perhaps I'll commission someone to fix this since I'd like it installed on other sites I have. Wish I would have known this in advance. Unfortunate.
Yes it can be installed fine on XF 1.5.2 and lower versions.
And you can you use even on XF 1.5.3/1.5.4.
Only can't be installed starting on version 1.5.3.
Thank you. I'm using this add-on with Xenforo 1.5.1 perfectly. Because I heard something error related to Xenforo 1.5.3, so I delay the Xenforo upgrade until the confirmation of this. With your information, I will proceed to upgrade Xenforo to 1.5.4 soon .
Thank you. I'm using this add-on with Xenforo 1.5.1 perfectly. Because I heard something error related to Xenforo 1.5.3, so I delay the Xenforo upgrade until the confirmation of this. With your information, I will proceed to upgrade Xenforo to 1.5.4 soon .
The issue was from the new security measures, it has something to do with serializations, to fix the install issue for newer xenforo versions use the attached XML file.