Thanks for this MrC!
I initially tried with Active Perl 184.108.40.2062 x64, but this caused Opus to crash when the rename preview was enabled (Jon and Leo informed). When I uninstalled Active Perl 220.127.116.112 x64 and installed 18.104.22.1684 x64, the crash disappeared.
I had same problem as aussieboykie in that date-manip was not installed, and had to run ppm install date-manip, so you might want to mention this in the first post MrC. One other suggestion to help beginners, would be to explain that they need to import the .orp file using the rename dialog File menu, and then to create/save a preset (eg. named "_Dynamic Renamer 1.11")