I redownloaded and installed through plugin manager and it worked without error.nd also I checked my issue of all blogs in multisite.
As from a short test , It is working fine.
But I came to know something noticeable(perhaps a small error) in this feature.
Actually I had two sample multisites.I tested the added feature of 'all blogs' in both. What is happening is :
In 1 website when I have clicked the all blogs it has disabled the dragging of individual blogs.(there was just 1 main blog in it)
In another when I clicked the all blogs the individual blogs can be dragged and dropped too.Though functionally 'all blogs' has superceded and is working fine.but this was a small thing(perhaps a small bug) I found.
You may look into it whenever you find time.