It will be available by the AutoCAD Communication Center notification for live updates and also on:

AutoCAD 2005 Support Downloads
http://www.autodesk.com/autocad-updates
AutoCAD LT 2005 Support Downloads
http://www.autodesk.com/autocadlt-updates

The AutoCAD 2005 Service Pack 1 ReadMe link Click Here

The AutoCAD 2005 Service Pack 1 Download
The AutoCAD LT 2005 Service Pack 1 Download

Who Should Install the Service Pack?

Summary of the Primary Issues Resolved by the Service Pack

• Closing a sheet without saving it after adding a view and saving the resource drawing.
  
• Exiting the program with the Customize dialog box open.
  
• Using SHADEMODE with XCLIP on and textures enabled.
  
• Switching to model space viewport with UCSFOLLOW set to 1.
  
• Navigating to certain DWF™ files in Windows Explorer.
  
• Using HYPERLINK in certain drawings with the application window maximized.
  

• A layer filter can now have a name that starts with an accented character.
  
• In the Options dialog box, Profiles tab, clicking Add to List no longer incorrectly removes backslashes in a UNC path.
  
• In DWF files, hyperlink fields with SHX fonts no longer fail.
  
• A hatch no longer bleeds when you change the hatch type.
  
• Using the PEDIT Spline option with a 3D polyline no longer generates an error when you use AUDIT or RECOVER.
  
• A problem that caused the program to sometimes lock up during startup after menu or toolbar changes has been fixed.
  
• An issue that caused the screen menu to collapse under certain circumstances has been fixed.
  
• Edges on Architectural Desktop objects and other custom objects are now displayed correctly when SHADEMODE is set to Gouraud or Flat shading with edges on.
  
• The message “Unable to find the asmm80enures.dll” is no longer displayed when modeler dlls are being loaded on computers with mixed language environment.
  

• Changing properties of block attributes in BATTMAN no longer makes unwanted changes to color.
  
• Blocks with similar names are now displayed correctly in the QSELECT list.
  
• Property fields in a block attribute now resolve correctly after INSERT.
  
• Block attribute text that contains fields now mirrors correctly.
  
• The Save Changes prompt is now correctly displayed after you use the Write Block dialog box.

• Child dimension styles are sorted correctly in the Dimension Styles Manager.
  
• Issues with directions and positions of arrowheads and text have been fixed.
  

• The “Command still active” message is no longer displayed when you try to close a drawing after you have canceled a PLOT command that was started with a maximized viewport active.
  
• The CALCOMP8.HDI driver, which plotted only to file, now plots normally.
  
• HIDEPRECISION can now be set for background plots.

• The Layer dialog box and the Plot dialog box now open faster.
  
• Performance is improved for use of ETRANSMIT for part of a large sheet set.
  
• A slowing of performance when multiple users are editing a sheet set at the same time has been improved.
  
• A problem that caused the program to use 99% of the system resources if you are using VBA applications and have the View toolbar open has been resolved.
  

• Switching from one text style with a Big Font to another no longer causes the SHX font to change unexpectedly.
  
• Typing over selected multiline text in the text editor no longer applies the color of the selected text to the new text.
  
• Misalignment issues with Japanese text have been resolved.
  
• Issues with inappropriate display of Czech, Latvian, and other language characters have been resolved.

• Side-by-side installation of AutoCAD 2004 and AutoCAD 2005 no longer causes errors in VBA scripts.
  
• A REVCLOUD conflict with VBAIDE has been resolved.

• Certain xrefs whose relative paths did not resolve now resolve correctly.
  
• Relative paths for certain xrefs no longer change when xrefs are loaded.