After many, many months of waiting Cisco finally managed to build new version of CSR1000v 3.13 that is compatible with VMware ESXi 5.1. Another quiet release without release notes. As with earlier 3.13 versions this new 03.13.01S build is available only in OVA format without purchasing license (csr1000v-universalk9.03.13.01.S.154-3.S1-ext.ova). Not to worry as you can extract ISO image and even BIN images if needed for upgrading older install from OVA. If you're coming from 3.12 or older with eval license (which allowed creation of eval license locally) you'll need new licenses. Usual two month license is available from Cisco portal but it's extra step compared to 3.12. Another difference is performance levels for unlicensed and eval licensed modes. Unlicensed 3.12 is 2,5Mbit/s, eval licensed 3.12 is 50Mbit/s, unlicensed 3.13 is 0,1Mbit/s and eval licensed 3.13 is 10Gbit/s.