The following error occurred while installing.
Not aware of any issue, though you may try another release to check if the same applies:
https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-MDK/Download#infotabs
I found this package installed incorrectly from 8.25.0 onwards
I can check with the developers if they have any suggestion, in the meantime what version of Keil are you using? The latest at the moment seems to be 5.31 from http://www2.keil.com/mdk5
