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The Arroway collection of materials and textures was always available since the early versions of Maxwell. For this new version, clients asked us to make sure the installation pack was lighter so they could download it faster, so we decided to remove the Arroway collection and a number of other textures. Of course, the collection is still available for clients on our website. 
However, we did leave one Arroway texture in the installation file so you can test it – the first wood material, named "boards-01". 

You can download the whole material collection from the Customer Portal (Download area), under "Additional Contents".

The improvements in the Maxwell Render version 2 material system allow you to create better, more complex, and faster materials. Version 1.x materials are compatible with version 2, but a small number of version 1.x materials (and therefore scenes) may not look entirely correct. We recommend to re-do as many version 1.x materials in version 2 as possible to make them into materials of a far superior quality. 

The only materials that can present difficulties are SSS materials and Clipmap materials.

The new SSS system in V2 is better integrated into the general BSDF structure, making it more intuitive and easier to configure. As the new SSS model is slightly different to the old one, your old SSS materials might appear slightly different when rendered in the new version.

To get them to look the same again, you will have to raise your Scattering Coefficient to a higher value.

The new stacked layer system allows you to create more complex materials in a more intuitive way.  Previously, you had to play with transmittance maps to get a simple Clipmap. Now, to create a Clipmap material, simply set up your material as usual, and apply the Clipmap in the Opacity/Mask map in the Layer Properties panel. See the Clipmaps page for more details.

Check your transmittance color and attenuation distance. The attenuation distance should be around 3cm for common glass and about 40cm for high grade glass. You must also check your scene scale. Finally, make sure your transmittance color is set to anything other than pure black (0,0,0).

The .r2 files (which controlled the falloff between the color at 0º and 90º) have now been replaced by the r2 numerical boxes, where you can directly introduce the two values included in the .r2 file. The result is the same, but the use is now more straightforward.