Installing Rhino 5.0 WIP will not affect Rhino 4.0 - you can have both on your computer at the same time.

What's New, WIP 2009-11-17 (17-Nov-2009)
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Enhanced Features:

• DimRotated: Now remembers the last angle used as the default for the next dimension.
• Explode: A warning dialog now appears when exploding very large meshes.

• Dim: The current dimension style name is now part of the command options for all of the dimension commands.
• ExtendCrvOnSrf: A problem where a curve is extended beyond the edges has been fixed.
• Leader: Text moved when a leader was exploded. This is fixed.
• MaterialEditor: Several problems with the preview display have been fixed.
• Radius: Reverted to V4 behavior allowing pre-picked curves. New options provide more selection options.
• Save:STEP: A problem with closed files creating open meshes has been fixed.
• Save:VRML: Texture color was incorrectly replaced by material color when the mesh objects are exported and imported with VRML format.  This is fixed.
  
• Save: Reading and writing files larger than 4 GB is now supported.  This required a change in the file format. The latest Rhino 5.0 WIP will read any files. Using the SaveAs command, you can save files for V2, V3 or V4. 
   
  If you save a V5 file that supports larger files and try to read it in an older Rhino V5 WIP, the older Rhino V5 WIP will tell you the file was written by a newer version of Rhino.  The fix is to download the newest V5 WIP.
  

• RecordAnimation: A new option remembers a previously used target folder or allows it to be changed.
• ReduceMesh crash fixed.

• Dim: New arrowheads with longer 4:1 and 6:1 aspect ratios are now available.

• Dim: Moving the dimension text out of line with the arrows, the arrows incorrectly flipped to the outside of the extension lines. This is fixed.
• Leader: Changing layers in the middle of the command incorrectly did not apply the new layer. This is fixed.
• Line: When using the BothSides and Normal options to draw a line on a surface, typing a number for the length incorrectly did not draw on both sides. This is fixed.
• Loft: History ignored point objects when updating the loft. This is fixed.
• MoveEdge: A failure bug has been fixed.
• MoveFace: A failure bug has been fixed.
• ReduceMesh crash fixed.
• Render: Surfaces in the Layout incorrectly showed up in a Render of the model space. This is fixed.
  
• Sweep2 crash fixed.
• Trim crash fixed.

• Dim: Degrees, minutes, seconds added as angular units.

• DimAngle: A new ability to select arcs or polyline arc segments has been added. Rhino automatically draws extension lines from the arc ends towards a center tic and place the angle dimension between the extension lines.
• History: You can now edit the properties of a history locked object, like change the layer or color or use analysis commands that do not affect the geometry and therefore do not break the history.
• SketchUp Export now tries to make outer and inner boudaries out of planar mesh regions.  This makes the output more user friendly in SketchUp.  You can use the Push/Pull tool on whole walls now instead of single triangles.

• Crv2View crash fixed.
• DimOptions: The way that fractions and feet and inches were displayed in the dimension dialog box and on the sheet were different. This is fixed.
• Intersect: A failure bug has been fixed.
• Layout: The ViewportPrint color option did not work properly. This is fixed.
• Loft: Pressing Enter to accept the defaults now works.
• MatchSrf crash fixed.
• MaterialEditor: Browsing for a material did not work when VRay was the selected renderer. This is fixed.
• RhinoRender: Transparent background left an extra pixel around objects. This is fixed.
• Surface/Surface Intersection: Many failure bugs have been fixed, especially where surfaces intersect at tangent points.
• Surface/Surface Intersection: Now returns surface isoparametric curves when possible.

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