After you download and install the SDK, it should be placed in the Keil directory (e.g. C:\Keil_v5\ARM\Device\Nordic). The old SDK folders will be renamed to '*_Backup' and the folders 'nRF51822' and 'nRF51422' will contain the new SDK.
Now you can open the Keil projects in these folders. If you have a custom application stored in the old SDK folder structure which includes the SDK libraries using relative paths (default in the example projects), you would need to copy your project over to the new SDK folders. But be aware that you probably need to port your code as well in order to make it work with the new SDK libraries.
After you download and install the SDK, it should be placed in the Keil directory (e.g. C:\Keil_v5\ARM\Device\Nordic). The old SDK folders will be renamed to '*_Backup' and the folders 'nRF51822' and 'nRF51422' will contain the new SDK.
Now you can open the Keil projects in these folders. If you have a custom application stored in the old SDK folder structure which includes the SDK libraries using relative paths (default in the example projects), you would need to copy your project over to the new SDK folders. But be aware that you probably need to port your code as well in order to make it work with the new SDK libraries.
