Find the icon pack version history with respective download links and whatnot here.

Guides:

• [Guide] How to Create and Change your Windows Folder Icons
• Anime Icon Directory (Work in Progress)

Anime Folder Icons Full Pack: 

Latest version (updated 10/23/2016): http://go.sei.moe/2ex6Mvt 

Previous versions:
07/08/2016: http://bit.ly/29hVplV
05/01/2016: http://bit.ly/1mXoSGe

Anime Folder Icon Packs per Season:

[Latest upload] Spring 2017

Previous seasons:

• Winter 2017 [Post] [Download]
• Fall 2016 [Post] [Download]
• Summer 2016 [Post] [Download]
• Spring 2016 [Post] [Download]
• Winter 2016 [Post] [Download]
• Fall 2015 [Post] [Download]
• Summer 2015 [Post] [Download]
• Spring 2015 [Post] [Download]
• Winter 2015 [Post] [Download]
• Fall 2014 [Post] [Download]
• Summer 2014 [Post] [Download]
• Spring 2014 [Post] [Download]
• Winter 2014 [Post] [Download]
• Fall 2013 [Post] [Download]
• Summer 2013 [Post] [Download]
• Spring 2013 [Post] [Download]
• Winter 2013 [Post] [Download]
• Summer & Fall 2012 [Post] [Download]
• Spring 2012 [Post] [Download]
• Winter 2012 [Post] [Download]