it seems that the Data ONTAP 8.3RC1 file is corrupt:
I have downloaded the vSIM for VMWare ESX: http://mysupport.netapp.com/NOW/download/tools/simulator/ontap/8.3RC1/vsim_esx-cm.tgz
Could you please be so kind and check the published version?
I am getting this error with WinZip and 7-Zip on Windows 7 x64.
Thank you in advance and many regards,
Somehow the download gets corrupted with Chrome and Firefox.
I managed to get it with IE 11 after resuming the download after a connection reset error message.
For me this also applied to 8.2.3 and 8.2.2P1.
Can you file a support site ticket for this issue? http://mysupport.netapp.com/eservice/assistant
Done, Case# is 0040938028