Lets install Indy 10 in Lazarus.
Lazarus has this cool feature called Online Package Manager (OPM).
If you cannot find it under Package menu, go to package\install/uninstall package and move it from right column (availabe) to left column (install).
Save and rebuild ide, and restart.
Now, go to OPM and install Indy and you are done : never been so easy 🙂