Hi,
Thanks for reporting this. The first message is normal and just warns you that the Maps folder will be added to you user paths so the textures can be found automatically. You should click Yes when it pops up.
The second one is because at present our script looks for a scanline library as a fallback in the event that you are not using either V-Ray, Corona, or Arnold. We didn't include this library in the beta, and in fact we've decided to change this for final release so that it falls back to physical materials instead which should provide more options for people converting to other engines or exporting to other apps.
Many thanks,
Paul