The Plugin Manager in Confluence is, in itself, a plugin. If it fails to initialise properly during Confluence's start-up, then the links it provides may be missing from the administation console.
Check the Confluence logs to see if there are any errors during start-up. See our Working with Confluence Logs documentation guide.
Ouch, could you not capitalise every word? It makes it VERY hard to read.
You need to check your permissions first - do you have all the admin rights? Next, check the list of plugins to see if any are disabled because of loading errors.
Joseph was right. Most likely, Universal Plugin Manager (the new plugin manager in 3.4.x onwards) failed to initialise properly upon startup due to this known issue. You should still be able to access the old plugin manager by direct accessing it at http://confluence-path/admin/viewplugins.action. If UPM turned out to be disabled (which most likely is the case), then you just need to enable it to make the link appear in Admin Console as normal.
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