Yes, you're right, but that specific problem has been resolved.
Two days after this post, I noticed there was a new version of osclass, the 3.2.2.
I downloaded and installed it.
What I found were not the theme Real Estate, nor the plugin Real Estate Attributes Plugin for the new version, however there asked me if I wanted to install it anyway, and I did.
When testing I observe that both the theme and the plugin worked well. But when I consult any publication (house, apartment, etc..) there are not shown any of the attributes of the (house, apartment, etc.).
Therefore, I consider that the new osclass version 3.2.2 only missing three (3) things:
1). - The Real Estate theme for osclass version 3.2.2
2). - The Real Estate Attributes Plugin for osclass version 3.2.2, and
3). - When viewing a publication, display the attributes placed through the Real Estate Attributes Plugin.
Thank you very much.