Due to the current situation with DNS service(more info on no-ip.com) - 4SE download server was down for couple of days.

To fix this issue 4SE Team has released a new software version V2.0.3, which can be downloaded from the support site.

2014.07.14 V2.0.3
Published on Thursday, 03 July 2014

• Fix for no-ip DNS service
  

Download Link:http://unlock.se/index.php/downloads


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2014.02.17 V2.0.0
Published on Monday, 17 February 2014

Whats new:

• Credit-based unlock added for MSM7225A, MSM7227A (ST21, ST23, ST26, C15xx, C16xx)
  
• New recovery option added for A1 and A2 models: Write GDFS/TA image (SSW)
  
• Prede****d GDFS and Trim Area images added for all known models A1, A2
  
• C1904, C1905 models chipset record fixed
  
• MSM8230 AID check bug fixed
  
• LOCOSTO logic for UART-enabled devices fixed
  
• Startup error reporting improved
  
• New installation package (remove old 4SE version before install)
  

Download Link: Tool4SEV200 or http://unlock.se/index.php/downloads
Reseller List: 4SE - Authoried Distributors and Resellers

Update for 4SE is ready!!!
2013.09.09: V1.9.1

Whats new:

    Added support for chipsets: MSM8960P, MSM8230, MSM8974, APQ8064, MT6589
    Added models: Xperia C (C2305, S39h), Xperia L (C2104, C2105, S36h), Xperia M (C1904, C1905), Xperia Z (C6602, L36h, C6603, C6606, C6616, SO-02E), Xperia ZL (C6502, L35h, C6503, C6506), Xperia ZR (C5502, M36h, C5503), Xperia Z Ultra (C6802, XL39h, C6806, C6833, C6843), Xperia Tablet Z (SO-03E, SGP321, SGP341, SGP311, SGP312)
    HTTP proxy connection support added for server communication
    Reset user code bug fixed (reset flash flag was missing) for some models
    USBFlash signed drivers added
    Database engine updated
    Splash layout fixed

Download link : Tool4SEV191

VERSION 1.9.0

• Added support for MSM7227A chipset
  
• Xperia miro (ST23), Xperia J (ST26), Xperia TX (LT29), Xperia T (LT30), Xperia V (LT25), Xperia E (C1504, C1604) models added to a list
  
• EROM'less A1 phones recovery bug fixed (assume flashing operation will rewrite cert)
  
• Italian, German, Dutch and Polish locales improved
  
• Slovak and Indonasian locales added
  
• Extra confirmation added for closing with active downloads
  
• S1 flashing now uses disk cache instead of RAM for unzip
  
• SmartCard update (if requires) warning added
  
• Signature unlock tab stays hidden for empty server login details
  
• New splash design
  

UPDATE LINK : http://www.4se.com/index.php/downloads