Welcome to 4D v15. If you are familiar with 4D's continuous delivery (R-release) program, you know that this version can be seen simply as a new step forward after the 4D v14 R5 release. In fact, 4D v15 is a "4D v14 R6", meaning that it contains only a short and fully tested list of new features, compared with the 4D v14 R5 release. 

Two "upgrade" manuals are released for 4D v15:

• The current "R-release edition" manual only describes new features and implementations added between 4D v14 R5 and 4D v15. Read this manual if you are a member of the R-release program and just want to know what's new since 4D v14 R5.
  You can download the previous R-release Upgrade manuals (PDF):
  
  • 4D v14 R2 Upgrade
    
  • 4D v14 R3 Upgrade
    
  • 4D v14 R4 Upgrade
    
  • 4D v14 R5 Upgrade 

• The "4D v15 - Upgrade (standard edition)" manual describes all features that have been included between the 4D v14.x and 4D v15 releases - that is, a compilation of all new 4D v14 R-release features, including those added after 4D v14 R5. Read this manual if you are not a member of the R-release program, or if you may have missed some interesting features introduced during the R-release process.