installation failure when installing jcl-2.4.1.4571 for delphi 7

Question

I've installed JEDI/JCL on several machines over the years, in WinXP/Delphi 5 and D2007, and now on 3 different machines that have Windows 7 Ultimate and DXE and DXE5. I remember having some problems with the install years ago, and on one of the 3 Win 7 boxes I had trouble installing it in DXE. The problems were with compiling the installer such the install.bat aborted early, reporting F1026 on Forms.dcu.

I could not find anything different about this one Win7/DXE box, so none of the usual recommended solutions helped at all.

What solved the problem for me was opening a command window in the folder containing install.bat and simply running the following command for DXE:

install d15

That ran the process of installing JCL and then I repeated the same command in the folder for JVCL.

I only use DXE5 for a deployment to OSX that doesn't use JEDI, so I don't yet know if using the following command will work for DXE5:

install d19

Oh, don't forget to uncheck the boxes for versions of Delphi you don't want to install. These options are on separate tab-pages for each version of Delphi.