Thank you Darrin for helping Michael.
I just want to add several things. Here is some additional information about migration
1. Both sites that are involved in the migration (Sitefinity 3.7SP4 and 5.x projects) should be running on IIS.
2. Please follow the steps described in the Migration Guide - article 1
and article 2
When migrating a 3.7 SP4 website to Sitefinity 4.x / 5.x please make sure to review the following article, which shows how a projects needs to be set so it is correctly migrated:
Additionally, you might the following article useful:
If you want to contact you with a partner, please open a support ticket.
the Telerik team
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