Hey Luis,
I knew that "Simball.mxs" wasn't in the preview folder but resided in the "library" folder for v3. The problem is that my "Maxwell Render 4" Program Files directory has no "library" directory, nor does my "Maxwell for Max" directory. Also, neither of them had the Simball.mxs scene file in them anywhere after installation:
Code: Select allC:\Program Files\Next Limit\Maxwell Render 4>dir
Volume in drive C has no label.
Volume Serial Number is ####-####
Directory of C:\Program Files\Next Limit\Maxwell Render 4
11/10/2016 11:00 AM <DIR> .
11/10/2016 11:00 AM <DIR> ..
03/09/2016 12:24 PM 597,976 clAmdFft.Runtime.dll
10/04/2016 01:04 PM 366,016 cudart64_80.dll
10/31/2016 10:32 AM <DIR> extensions-x64-v120
10/31/2016 10:32 AM <DIR> extras-x64-v120
10/31/2016 10:32 AM <DIR> hdri
10/31/2016 10:32 AM <DIR> ies
10/31/2016 10:32 AM <DIR> imageformats
10/31/2016 10:32 AM <DIR> images
10/31/2016 10:32 AM <DIR> layouts
06/24/2016 06:10 AM 2,077,184 libeay32.dll
12/14/2015 04:05 PM 11,776 libEGL.dll
12/14/2015 04:04 PM 2,013,696 libGLESv2.dll
06/24/2016 06:10 AM 379,392 libssl32.dll
10/28/2016 06:15 AM 1,889,280 licenseactivator.exe
10/31/2016 10:32 AM <DIR> materials database
10/28/2016 06:15 AM 5,083,136 maxwell.exe
10/28/2016 06:32 AM 32,291,282 maxwell_license_manager_win64.exe
10/14/2016 07:05 AM 18,080,605 maxwell_onshape_connection_win64.exe
10/28/2016 06:15 AM 16,389,632 mxcommon-x64-v120.dll
10/28/2016 06:15 AM 3,641,344 mxed.exe
10/28/2016 06:15 AM 1,503,744 mximerge.exe
10/28/2016 06:15 AM 3,622,400 mxnetwork.exe
10/28/2016 05:35 AM 7,996,416 mx_shell.dll
03/09/2016 12:24 PM 54,784 OpenCL.dll
10/31/2016 10:32 AM <DIR> platforms
11/10/2016 11:13 AM <DIR> preview
10/28/2016 06:11 AM 1,974,784 pymaxwell.exe
10/31/2016 10:32 AM <DIR> python
11/21/2015 10:37 AM 2,964,480 python27.dll
12/14/2015 04:07 PM 25,088 Qt5Concurrent.dll
02/03/2016 11:59 AM 5,548,032 Qt5Core.dll
12/14/2015 04:11 PM 6,000,128 Qt5Gui.dll
12/14/2015 04:09 PM 1,068,544 Qt5Network.dll
12/14/2015 04:16 PM 322,560 Qt5OpenGL.dll
12/15/2015 12:20 AM 1,245,696 Qt5Script.dll
12/15/2015 12:21 AM 561,664 Qt5ScriptTools.dll
12/14/2015 04:16 PM 5,495,296 Qt5Widgets.dll
12/14/2015 04:07 PM 193,536 Qt5Xml.dll
10/31/2016 10:32 AM <DIR> scripts
10/31/2016 10:32 AM <DIR> sdk
10/31/2016 10:33 AM <DIR> shell
10/31/2016 10:32 AM <DIR> simulens maps
10/31/2016 10:32 AM <DIR> skies
06/24/2016 06:10 AM 379,392 ssleay32.dll
10/31/2016 10:32 AM <DIR> tp_network
11/10/2016 11:00 AM 172,186 uninstall.exe
03/09/2016 12:23 PM 7,194,312 vcredist_x64.exe
Code: Select allC:\Program Files\Next Limit\Maxwell For Max>dir
Volume in drive C has no label.
Volume Serial Number is ####-####
Directory of C:\Program Files\Next Limit\Maxwell For Max
11/08/2016 04:20 PM <DIR> .
11/08/2016 04:20 PM <DIR> ..
03/09/2016 12:24 PM 597,976 clAmdFft.Runtime.dll
10/04/2016 01:04 PM 366,016 cudart64_80.dll
11/08/2016 04:19 PM <DIR> extensions-x64-v120
11/08/2016 04:19 PM <DIR> extras-x64-v120
11/08/2016 04:20 PM <DIR> hdri
11/08/2016 04:20 PM <DIR> ies
11/08/2016 04:20 PM <DIR> images
06/24/2016 06:10 AM 2,077,184 libeay32.dll
12/14/2015 04:05 PM 11,776 libEGL.dll
12/14/2015 04:04 PM 2,013,696 libGLESv2.dll
06/24/2016 06:10 AM 379,392 libssl32.dll
10/28/2016 06:15 AM 1,889,280 licenseactivator.exe
11/08/2016 04:20 PM <DIR> materials database
10/28/2016 06:15 AM 5,083,136 maxwell.exe
10/28/2016 06:32 AM 32,291,282 maxwell_license_manager_win64.exe
10/28/2016 06:15 AM 16,389,632 mxcommon-x64-v120.dll
10/28/2016 06:15 AM 3,641,344 mxed.exe
10/28/2016 06:15 AM 1,503,744 mximerge.exe
10/28/2016 06:15 AM 3,622,400 mxnetwork.exe
03/09/2016 12:24 PM 54,784 OpenCL.dll
11/08/2016 04:20 PM <DIR> platforms
11/08/2016 04:20 PM <DIR> preview
12/14/2015 04:07 PM 25,088 Qt5Concurrent.dll
02/03/2016 11:59 AM 5,548,032 Qt5Core.dll
12/14/2015 04:11 PM 6,000,128 Qt5Gui.dll
12/14/2015 04:09 PM 1,068,544 Qt5Network.dll
12/14/2015 04:16 PM 322,560 Qt5OpenGL.dll
12/15/2015 12:20 AM 1,245,696 Qt5Script.dll
12/15/2015 12:21 AM 561,664 Qt5ScriptTools.dll
12/14/2015 04:16 PM 5,495,296 Qt5Widgets.dll
12/14/2015 04:07 PM 193,536 Qt5Xml.dll
11/08/2016 04:20 PM <DIR> rlm
11/08/2016 04:20 PM <DIR> scripts
11/08/2016 04:20 PM <DIR> simulens maps
11/08/2016 04:20 PM <DIR> skies
06/24/2016 06:10 AM 379,392 ssleay32.dll
11/08/2016 04:19 PM 53,086 uninstall.exe
If that is different than what's on your system, try installing "maxwell_render_4.0.0.8_win64.exe" on a machine that didn't already have Maxwell on it or had Maxwell previously uninstalled. You could even take a peek directly into the ".exe" file's contents with a program like 7-zip using the Windows Explorer "Open Archive" option. The resulting directory tree is also missing the "library" directory.