We have been informed by the Climate Data Store that there are technical issues affecting access to the CMIP5 and CMIP6 data.
The Climate Data Store is actively working with the CMIP5 and CMIP6 data providers to restore full access to the data as soon as possible.
We will update this post as soon as we will have more information.
We are sorry for the inconvenience this is causing.
ECMWF Support