This text describes the contents of the release files of SoilGen3.8
It may be useful to consult this book:
    Peter Finke. 2024. Modelling soil development under global change.   
    SpringerBriefs in Earth System Sciences 10032. ISBN: 978-3-031-55582-4.
    https://doi.org/10.1007/978-3-031-55583-1 

The main folder contains the following files:
ReadMe.txt          = this file
agpl-3.0.txt        = The GNU Affero General Public License under which SoilGen is released (from: https://www.gnu.org/licenses/agpl-3.0.txt)
SoilGen3.8_code.pdf = a very brief summary of the structure of the code units
SoilGen.exe         = an executable of SoilGen3.8 (compiled for Windows 10 with FreePascal in Lazarus version 2.2.6) 
SoilGen.inf         = the file to be opened in the Lazarus IDE to consult and change source code
The other files make up the source code (see https://wiki.freepascal.org/File_extensions):
unt*.pas=Pascal code program statements, ascii
unt*.lfm=the layout of the forms ("windows", ascii)
unt*.o  =compiled unit, from compilation by Free Pascal (binary)
unt*.ppu=unit description file (binary)
SoilGen.res=compiled resource (binary)
SoilGen.lps=Lazarus Project Session file
SoilGen.lpr=Lazarus Program file, contains Pascal source of main program

Folders: 
backup                       = folder produced and filled by the Lazarus software
and: copy SoilGen.exe to each of the folders and start running...:
Newformation_5climates       = 5 subfolders, with inputfiles for 5 climate regimes to evaluate their effect on newformation and weathering of minerals (book: section 5.2.4)
OC-protection_Lanna          = inputfiles to investigate the effect of OC-protection mechanisms (book: section 8.2.4)
SoilProduction_Ash_final     = inputfiles to investigate Soil production in volcanic ash (book: section 5.2.6)
SoilProduction_Sediment_final= inputfiles to investigate Soil production in an alluvial sediment (book: section 5.2.6)

Under GPL, the codes are free to be used, modified, etc.
Appropriate referece to the book would be appreciated.
Perhaps also a good idea to give your variant a different name than SoilGen...

Happy computing!

Peter Finke
June 2024