I got that covered. Here are samples of the errors I experience:
Error 1 'Migration.MigrationModule.GetModuleConfig()': no suitable method found to override
Error 2 'Migration.MigrationModule.Upgrade(Telerik.Sitefinity.Abstractions.SiteInitializer, System.Version)': no suitable method found to override
Upgrade(SiteInitializer initializer, Version upgradeFrom)
So I tried to comment out the affected lines above since I don't think they make any sense. But alas, another error:
Error 1 The type or namespace name 'PageDataElement' could not be found (are you missing a using directive or an assembly reference?) C:\DIRECTORY\Sitefinity4.0\MigrationModule.cs
And I mean those aren't just the errors. In the part where I have to build a DLL for the 3.7 project, I got lots of errors too. I just got around after commenting-out lines that were causing an error and I was able to build the app. I still don't know what effect that will bring.