Does this conflict with any mods? Tried downloading the latest version from github and here. Both are marked as version 1.0 in game and when I load into witcombe park none of the cow barns have the pipes attached and the ramps are not visible which are outlined in the v1.2 description.
Viewing post in FS25_SlurryPipeSystem comments
Im not sure of any conflicts, the download will give you the latest version as the old version is removed and the latest is added.
I have just downloaded and tested the file from the link which is the latest version with the ramps on the slurry stores.
Try a new game with just SPS and see if you get the same issue, if you do let me know on here, gitHub or discord.