I only have WoT and Opera Ad-Blocker installed. Games installer response just fine like usual, it's just the bonus content maybe because they come in a bunch. To be specific, it's unresponsive when there are other items queuing on the downloader.
I'm having similar problems.
But in my case all the downloader links have this problem. Sometimes they work, but most clicks on the buttons don't result in a response.
If I keep clicking, at some point the download gets started. (1 - 33 tries so far)
It doesn't matter if the downloader software is already running or not. Opera just doesn't send a request most of the times. Also, no errors in its error log, concerning the downloader buttons.
Win7 x64 and Opera 12.00 (32 and 64-bit) with both the latest stable and beta Downloader.
I suspect it to be an Opera bug, they did change some engines with v12.
Maybe something with the way the links to the download are handled?