nRF52832 bootloader build issue with Keil uVision 5

The error you get indicate that you are using the evaluation version of Keil uVision, which has a code size limit. You either need to pay for a Keil uVision license, or use a different IDE. For the latter, I suggest using Segger Embedded Studio, which is free to use for nRF target devices (see Get a License for Nordic Semiconductor Devices).

Ah, that makes sense why I get the error only in the debug version of the example. Is there a documentation on how to build the bootloader using Segger Embedded Studio or using a Make setup by any chance? I chose Keil uVision because of Nordic's documentation for developing the bootloader used this IDE. 

As far as I can see the only thing pointing to Keil in the tutorial you are using is that it refers to Keil example projects. You will find SES projects right next to the Keil project in recent SDK versions, and the instructions are equally valid for SES.

As far as I can see the only thing pointing to Keil in the tutorial you are using is that it refers to Keil example projects. You will find SES projects right next to the Keil project in recent SDK versions, and the instructions are equally valid for SES.