If you have stand-alone perpetual license for LR5 you can download the correct installer here: https://helpx.adobe.com/lightroom/kb/lightroom-downloads.html
The CC version work with a subscription only.
I'm facing a similar problem. i downloaded the latest update of lightroom5 on my mac but when i try to export the processed image it doesn't export and gives me an error stating that some export operations could not be performed? it is not opening my Nik software through the "edit in " preference.
need help guys.
You won't get any answers by 'hijacking' an old and marked as solved thread, specially with a different problem.
Please open a new thread.
sorry that was not the intention. have posted the same enquiry kindly help.