Installing Android SDK Problem (SOLVED)

I few months before installed Android Sdk (adt bundle).There was a option named Android Api Lvel 20 system image revision 1 and I selected that and then clicked on install package option and paused the download then I had manually downloaded a Android System Wear Image of (Api Level 20, revision 1) (Size 100 mb nearly) and installed it by replacing it in the android temp folder(sdk/temp) and it worked nicely…But now again I want to install Android Sdk but now the option System Image wear v20 revision 1 has gone and it is showing revison 4 instead of revision 1 so if I now select the revision 4 and click on install package option and then pause it and replace the temp folder with the image of revision 1 I downloaded earlier, it is no more working…
So my question is how can I get the revision 1 option back in my Sdk…