TLDR Quick How‐to: Replacing default Indy on fresh install of Delphi 12

Installing Indy from source tends to be complicated to install due to a) preinstalled version of Indy, and b) an emphasis on backwards-compatibility with every version of Delphi (or Lazarus/Free Pascal) ever released.

This page has simplified step-by-step instructions for installing Indy from source on a fresh install of Delphi 12 (installed with the Offline installer using the RAD Studio, Delphi, C__ Builder 12.2 inline ISO (RADStudio_12_2_i_0329_C2CC.iso) image and Indy source on GitHub as of 12/20/2024) on Windows 10 x64.

The basic steps can probably be adapted for other versions of Delphi.

1. {exit out of Delphi}

2. {open Administrator Command prompt}

3. cd \Prog (or whatever your preferred folder is to hold the Indy source folder that will be created)

4. git clone https://github.com/IndySockets/Indy (assumes that git.exe is installed and is in the path)

5. cd Indy/Lib

6. Clean_Athens.cmd (removes default install of Indy)

7. Fullc_Athens.bat (rebuilds Indy. May be optional, as the resulting .bpl files aren't easily used, but will progamatically build the source and report any errors)

8. Note output: *.bpl files saved in C:\Users\Public\Documents\Embarcadero\Studio\23.0\Bpl but get moved to C:\Prog\Indy\C29\Win32\Release

9. Launch Delphi

10. Note error / confirm dialog: Can't load package c:\program files (x86)\embarcadero\studio\23.0\Bin\LivePreview290.bpl (click No to prevent this error in the future)

11. File / Open C:\Prog\Indy\Lib\Indy290.groupproj

12. For each project (in order) right-click and Build (Or right-click the top level group Indy290 and Build All)

13. right-click dclIndyCore290.bpl and Install

14. right-click dclIndyProtocols290.bpl and Install

15. Exit Delphi

16. Save changes to dclIndyCore290.dprog? click Yes

17. Save changes to dclIndyCProtocols290.dprog? click Yes

18. Launch Delphi

19. Tools / Options

20. Language / Delphi / Library / Library Path then click ...

21. In edit box enter: C:\Prog\Indy\Lib\Core then click Add

22. In edit box enter: C:\Prog\Indy\Lib\System then click Add

23. In edit box enter: C:\Prog\Indy\Lib\Protocols then click Add

24. Click OK then Save

Now you should be ready to use Indy in a new or existing project. When you build your project the new version of Indy will be linked in.