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.
![Ashampoo WinOptimizer 2017 Software (Free) [SharewareOnSale]](https://files.ozbargain.com.au/n/93/291893.jpg?h=968dc27f)

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.