Please understand that update may result in unpredicted result. Please make backup before update and try to update live sites on test installation first.
Mighty Resources 1.4 to 1.5.0 Update Instruction
1. You have to make DB backup before update from 1.4.x to 1.5.x
2. Install update, sql patch 1.5 and media pack.
3. Update all modules and field plugins.
4. Open resave resources global configuration.
5. Read about changes in templates and change your custom templates accordingly
6. Open and save all sections
7. Open and save all types
8. Open and save all fields plug-ins.
9. Install and publish Toolset plugin and run File Relocation tool.
Migrate Relate Fields
There are new relate parent3 and relate child3 fields along with version 2. You have 2 options.
1. Update Relate fields version 2 to enable compatibility with Resources 1.5
2. Migrate to Relate 3 fields. For that, edit field and change type to version 3, reassign all parameters and save. As saving format the same for Relate2 and Relate3 that should work good. And if you meet problem you may change field type back to Relate 2.
Update available only through Mighty Assistant