The archive contains:

3DSMax files (corona & vray)
Obj files (Obj & Mtl)
Maps
Preview
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Full Resolution previews links:

http://s7.picofile.com/file/8380865476/Reproducible_stairs_1_.jpg 
http://s6.picofile.com/file/8380865500/Reproducible_stairs_2_.jpg 
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poly: 1144623 (3 models)
verts: 1146762 (3 models)
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Stairs Height (one floor): 283 cm
Stairs Width: 124 cm
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Vray version: 3.60.03
Corona version: 2
3Dsmax Version 2013