1-computer lifetime license, I've not used the software before but PCMag seems to think it's alright, link below.
http://au.pcmag.com/ashampoo-winoptimizer-12
From the description: Ashampoo WinOptimizer 2017 is an excellent choice to free your system from junk data. Various powerful modules help you fix errors and boost the performance of your Windows PC.
The link uses the Shareware on Sale downloader, you can DL Winoptimser directly here:
http://download.cnet.com/Ashampoo-WinOptimizer-2017/3000-185…
And just use the key given on the Shareware on Sale page if preferred.