I got this problem when upgrading from 6.7u1 to 6.7u2 and solved it with the manual vib installation as well. Thanks so much for that tip - saved me lots!
[user@host:~] cd /tmp
[user@host:/tmp] wget http://hostupdate.vmware.com/software/VUM/PRODUCTION/main/esx/vmw/vib20/tools-light/VMware_locker_tools-light_10.3.5.10430147-12986307.vib
[user@host:/tmp] esxcli software vib install -f -v /tmp/VMware_locker_tools-light_10.3.5.10430147-12986307.vib
Installation Result
Message: Operation finished successfully.
Reboot Required: false
VIBs Installed: VMware_locker_tools-light_10.3.5.10430147-12986307
VIBs Removed: VMware_locker_tools-light_10.3.2.9925305-10176879
VIBs Skipped: