Manually install the SRP version for your specific use case by double-clicking and importing one of the SRP packages: Built-in, URP or HDRP.

1 - Make a new Bult-in, URP or HDRP project template using Unity Hub
2 - Install one of the packages that fit your newly created pipeline located in ""The Toby Foliage Engine -> "(TTFE)_Pipelines" folder.
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When you purchase the full version, you can simply replace the main directory upon import and get access to all the features.