i installed on my intel nuc esxi 6.7 before summer, using DSM_DS3617xs_23739.pat and OP steps without problems, added only one storage disk.
now i needed to move the storage drive in another location and finally i messed up, so removed the storage drive and made another one (i did not touch the VM or the synoboot drive).
Now i have to install dsm again but i am forced to install DSM_DS3617xs_25426 (says 23739 is too old) when i do the setup, but it always fails at 60% saying the file is broken (which is not).
I have the pat downloaded on pc, and i did not modify grub or lan settings since first installation.