I'm using DELPHI XE2 since E/2011. I checked now the implemented INDY Lib shipped with my compiler, and found gsIdVersion = '10.5.8.0';
If I want to upgrade to the latest INDY version, I use Indy download link
here I found LATEST INDY ZIP FILE. The date of the file is from today, the revision is is less then my installed indy version ID. bevore doing any further action, Can some help me and solve my version number confusion
According to the subversion repo, the latest revision for Indy 10 is r4910. The ZIP file that you link to is named Indy10_4910.zip. So that is as up-to-date as you can be.
The way to check something like this is to look at the source control repo yourself. The Indy website has a source control repo gateway page here: http://www.indyproject.org/sockets/Download/svn.EN.aspx
Update: If what @mjn says is true then the ZIP file may be out of date. I would always use svn to pull off the latest version.
来源：https://stackoverflow.com/questions/14424582/update-to-latest-indy-tcp-library-version