Why can't I edit this stage in BrawlBox?

[PegasusKnt]

[Edit: solved by updating to brawlbox 0.76]

I recently downloaded this altered castle siege stage: (https://modulous.net/mod/164/Castle Siege: Remix), and I'd like to make some changes to it in brawlbox. (Specifically, I'd like to separate the single platform into two smaller ones, to make the pegasus knight statue in the center more visible.) But every time I open it and preview the models, I get this error:

What's the deal?

 

[Xermo]

Try a newer Brawlbox version.

 

[PegasusKnt]

Try a newer Brawlbox version.

I have version 0.71, is there a newer version?

 

[Xermo]

There are several newer version ahead of .71

 

[PegasusKnt]

Thanks, I updated to 0.76 and that works. I originally thought 0.71 was the latest version because when I googled "brawlbox .72" I got like 2 results.