For Excel 2007 or for Excel 2010 32-bit (even Excel 2010 32-bit on a 64-bit operating system), use the 32-bit download.
For Excel 2010 64-bit, use the 64-bit download.
Just download and run the EXE. There is no need to uninstall the previous release. If you have problems getting the add-in to work, see the Troubleshooting Installation
Release 0.7.4 now properly handles languages but introduces no new features. International users who run a different Windows language than their Excel UI language may be receiving an error message when they double click a cell and perform drillthrough which reads: "XML for Analysis parser: The LocaleIdentifier property is not overwritable and cannot be assigned a new value
". This error was caused by OLAP PivotTable Extensions in some situations, but release 0.7.4 fixes this problem.