It is generally safe to install a newer version directly over an older one. Important Compatibility Notes
If adding new DLCs manually, extract them to your game directory (ensuring folders like abdata merge) and then re-run the HF Patch to ensure compatibility.
Open the game folder and run the InitSetting.exe or the dedicated launcher.
Note: It is often faster to unpack mods manually from the included mods zip folder rather than using the slow "sideloader" download method.
Most modern repacks (like BetterRepack) include a standalone launcher with an "Update" button .