If you're running from the ppm prompt, you can search then install by the number of the result.

What an awkward sentence that was! I'll just paste a screenshot:

ppm> search WriteExcel
Searching in Active Repositories
  1. Spreadsheet-WriteEx~ [0.41] (none)
  2. Spreadsheet-WriteEx~ [0.42] Write to a cross platform Excel binar
+y file
  3. Spreadsheet-WriteEx~ [0.42] Write to a cross platform Excel binar
+y file
  4. Spreadsheet-WriteEx~ [0.09] Convert a database table to an Excel 
+spreadsh~
  5. Spreadsheet-WriteEx~ [1.01] Create Excel Spreadsheet from XML
  6. Spreadsheet-WriteEx~ [1.02] Create Excel Spreadsheet from XML
  7. Spreadsheet-WriteEx~ [1.02] Create Excel Spreadsheet from XML
  8. Spreadsheet-WriteEx~ [0.03] A simple single-sheet Excel document
ppm> install 6
[download]