In the model both versions of the sofa.
If possible, the TurboSmooth modifier is left in the 3Ds Max 2013 file.
Export files without using TurboSmooth.
https://www.flexform.it/en/outdoor/products/sofas-sectional-sofa-ottomans/vulcano 
Dimension: 1016 x 2800 x H.740

Name: Vulcano_Flexform_Outdoor_Sofa_2
Version: 2013
Preview: Yes
Units: Millimeters
Polys: 642 830 (without TurboSmooth)
XForm: Yes
Box Trick: Yes
Model Parts: 54
Render: Corona
Formats: 3Ds Max 2013, OBJ, FBX