ESXi 5.5 missing VMware Tools ISOs

ESXi patches are cumulative. I just went from Build Number: 623860 to Build Number: 721882 skipping several patches. No problems.

VMware Employee Kyle Gleed says "Patches are cumulative. We typically release patch bundles every 3 months. A new patch bulletin will include all the updates/fixes from any earlier bulletins."

http://blogs.vmware.com/vsphere/2012/02/understanding-esxi-patches-finding-patches.html

I was just going to advise the OSP option, but the real fix is probably upgrading your ESXi host to the current revision/patch level. As of this writing, your build number is 1065491, and the current is 1483097.

VMware Tools often get incremented in the ESXi patch releases. It makes sense to keep your hosts up to date.