This covers installing Expedition Charter along with JP Era Overhaul and MrTroodon's Dinosaurs Behavior and Stats Overhaul. You can install either,  both or none of the compatible mods.

• [If using JPEO] Install JPEO
  - Download the latest release of JPEO (Lightweight or Complete): https://www.nexusmods.com/jurassicworldevolution/mods/143?tab=files
  - Install JPEO by dragging the contents of "<JP Era Overhaul zip file>\ovldata" into "Jurassic World Evolution\Win64\ovldata"
  -
• Install Expedition Charter 
  - Download the latest release of EChar: https://www.nexusmods.com/jurassicworldevolution/mods/666?tab=files
  - Install EChar by dragging the contents of "<Expedition Charter zip file>\ovldata" into "Jurassic World Evolution\Win64\ovldata"
  -
• [If using JPEO] Install the JPEO - EChar Compatibility Patch
  - Download the latest release of the "JP Era Overhaul - EChar - Compatibility Patch" (Lightweight or Normal, matching whichever version of JPEO you're using): https://www.nexusmods.com/jurassicworldevolution/mods/666?tab=files
  - Install the Patch by dragging the contents of  of "<JPEO - EChar Patch>\ovldata" into "Jurassic World Evolution\Win64\ovldata"
  -
• [If using MrTroodon's Stats Overhaul] Install MrTroodon's Behavior and Stats Overhaul
  - Download the latest version of ECHar-patched MrTroodon's Behavior and Stats Overhaul mod (the file called "Expedition Charter Patch"): https://www.nexusmods.com/jurassicworldevolution/mods/563?tab=files
  - Inject the files within the zip you downloaded into their appropriate Main.ovl files inside "Jurassic World Evolution\Win64\ovldata\<content pack folder>", i.e.:
  "c0dinosaurs.fdb" into "ovldata\Content0\Main.ovl"
  "content4dinosaurs.fdb" into "ovldata\Content4\Main.ovl"
  "contentpdlc1dinosaurs.fdb" into "ovldata\ContentPDLC1\Main.ovl"
  etc
  using the Cobra Tools' ovl_tool_gui (https://github.com/OpenNaja/cobra-tools/releases)
  -
• [If using MrTroodon's Stats Overhaul] Patch MrTroodon's Stats Overhaul to the latest EChar patch
  - Download the latest version of the "MrTroodon Stats Overhaul - EChar - Compatibility Patch": https://www.nexusmods.com/jurassicworldevolution/mods/666?tab=files
  - Like with the last step, inject the contents of the files within the zip you downloaded into their appropriate Main.ovl files inside "Jurassic World Evolution\Win64\ovldata\<content pack folder>"