The archive contains:

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

http://s6.picofile.com/file/8381020118/Reproducible_stairs_2_1_.jpg 
http://s6.picofile.com/file/8381020200/Reproducible_stairs_2_2_.jpg 
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poly: 1642812 (3 models)
verts: 1646319 (3 models)
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Stairs Height (one floor): 283 cm
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Vray version: 3.60.03
Corona version: 2
3Dsmax Version 2013