Full Changelog: https://github.com/LuckyPennySoftware/AutoMapper/compare/v14.0.0...v15.0.0

• Added support for .NET Standard 2.0
• Requiring license key
• Moving from MIT license to dual commercial/OSS license

To set your license key:

services.AddAutoMapper(cfg => {
    cfg.LicenseKey = "<License key here>";
});

This also introduced a breaking change with MapperConfiguration requiring an ILoggerFactory for logging purposes:

public MapperConfiguration(MapperConfigurationExpression configurationExpression, ILoggerFactory loggerFactory)

Registering AutoMapper with services.AddAutoMapper will automatically supply this parameter. Otherwise you'll need to supply the logger factory.

You can obtain your license key at AutoMapper.io