S4PE – Sims 4 Package Editor

Full support for LRLE image format, including import/export to/from PNG
Support for new versions of CASP, TONE, SIMO, CFEN, CRTR, and CSPN
Tuning updated
Tweaked handling of DDS mipmaps
Compiled as 64-bit. Every component is now 64-bit, which should improve speed and memory management
Addition of an s4pi Library of dlls compiled for AnyCPU, which should be used as references for projects compiled for AnyCPU or 32-bit
Note: It’s possible the conversion to 64-bit will eliminate the need to use 7-zip, but time will tell.

To post feedback you can use this thread at MTS.

You MUST use 7-zip to uncompress the binary : 7-zip is free and available here. Extract the .7z, open the folder, and run s4pe.exe.