... or, use PPM from the command line:

C:\ppm search Date::Calc
Downloading ActiveState Package Repository packlist...done
Updating ActiveState Package Repository database...done
Downloading trouchelle packlist...not modified
Downloading 1400.perl packlist...failed 500 Can't connect to ppm1400.p
+erl.info.pl:80 (timeout)                                          # s
+**t happens
Downloading log4perl packlist...redirect
Downloading log4perl packlist...done
Downloading log4perl Log-Dispatch-FileRotate PPD...not modified
Downloading log4perl Log-Dispatch PPD...not modified
Downloading log4perl Log-Log4perl PPD...done
Downloading log4perl Params-Validate PPD...not modified
Downloading sisyphusion packlist...not modified
Downloading wxperl packlist...not modified
Downloading bribes packlist...done
Updating bribes database...done
1: Date-Calc
   Gregorian calendar date calculations
   Version: 6.3
   Released: 2009-10-31
   Repo: ActiveState Package Repository

2: Date-Calc
   Gregorian calendar date calculations
   Version: 6.3
   Repo: trouchelle

C:\ppm install 1                           # install "1" (from AS) rat
+her than "2 
Downloading Date-Calc-6.3...done           # makes no difference here,
+ but sometimes
Unpacking Date-Calc-6.3...done             # repositories will have di
+fferent vers.
Generating HTML for Date-Calc-6.3...
[download]

and, BTW, if you goof, PPM will generally save you and say  Run 'ppm help' to learn more.. HTH