|So I guess i'll have to try the other option in Upgrading from ActivePerl 5.8.x
No - those instructions relate to upgrading from one version of perl 5.8.x to a more recent version of perl 5.8.x. But they don't apply to upgrading from 5.8.x to 5.10.x.
In step 2, the site/lib directory also needs to be deleted since it could (and almost certainly would) contain modules that are binary-incompatible with 5.10.
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