Download CosmoCalc.xla to the Windows system folders:
Excel XP(2003) on Windows XP:
C:\Documents and Settings\UserName\Application Data\Microsoft\AddIns
Excel 2000 on Windows 98:
C:\Windows\Application Data\Microsoft\AddIns
Figure 1: If you can't find the systems folder, select Tools ®
Add-Ins ® Browse... This takes you to the Add-Ins
directory, the path of which can be seen from the pull-down menu.
Figure 2: Downloading CosmoCalc.xla to the Add-Ins folder makes
CosmoCalc available to all directories. Start Excel and select
Tools ® Add-Ins. An Add-In is enabled when its checkbox
is marked. The Add-In is disabled by unmarking the CosmoCalc
checkbox
Figure 3: If the previous commands don't work, please check
if your Excel Macro Security settings are not set too high.
Click Tools ® Options ® Security
® Macro Security ® Medium.