When trying to install JCL and JVCL into Delphi 10 Seattle using the GetIt Package Manager I get an error:
"Windows 7 Professional Service Pack 1 (6.1.7601)
JVCL 3.50.0.0
[Generating: Packages] Generating packages for D15 Loaded template.dpk Loaded template.dproj Loaded template.rc [Compiling: Packages] [Compiling: JvCore150.bpl] Embarcadero Delphi for Win32 compiler version 22.0 Copyright (c) 1983,2010 Embarcadero Technologies, Inc. C:\Users\Lars\Documents\Embarcadero\Studio\17.0\CatalogRepository\JEDIVisualComponentLibraryJVCL-3.49\Common\jvcl.inc(26) Fatal: F1026 File not found: 'jedi\jedi.inc' "
JCL version is 2.8.0 that is available via GetIt Package Manager
This question has some resemblance with Error in JCL installation
I succeded to install JCL and JVCL by download a ziped version (JVCL349CompleteJCL27-Build5676.zip) containing both JCL and JCVL from http://jvcl.delphi-jedi.org/
The problem I had seams to relate to multible installations of Delphi and several versions of JCL in the path. If I just installed for DX, it worked fine :)