personally I wouldn't, I've got 96 < on my VU+, if its working at the moment I would leave it be, even when you've only got 35 updates, the amount of times I've seen boxes get stuck in a boot loop after software update, I tend to go the whole hog though when I update, I just reflash.
You can, if you really want to update E2iplayer on it's own, either remove the plugin and then install it again, or Menu -> Setup -> Software Management -> Advanced -> IPKG\Packet Manager and look for enigma2-plugin-extensions-e2iplayer