I installed berrybrew 1.22 on a vanilla win10 VM, installed and switched to Perl 5.10.1_32, then ran the new installer.

I have made some changes to the installer after the OP (you can get it here.

Here's the result of those actions:

C:\Program Files\Mono>echo %path%

C:\Program Files\Mono\bin\;C:\berrybrew\5.30.0_64\c\bin;C:\berrybrew\5
+.30.0_64\perl\bin;C:\berrybrew\5.30.0_64\perl\site\bin;C:\Windows\sys
+tem32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\Windows
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