Hi @rasta, just in case you haven’t seen it, this workaround allowed me to install the Kali template on R4.1.
Note that the space is needed during the installation, but becomes available again once the installation is done. The cost of the workaround for me was loosing 1 day of logs (I needed a little less than 1GB of extra space and removing 1 day of logs was enough), your situation may be different.