1. you can download skin packs in download page
2. select your os then select a skin pack you want to read more and details.
3. now you can see a screenshoot of skin pack if you liked click in download.
we have 2 option for download : offline installer and online installer with auto fix bugs its recommended to use.
Note: if you have 32 bit os download x86 file and if you have 64 bit os download x64 file, you can find it in: Control Panel\System and Security\System
you can watch video about how to install and unistall a skin pack here