I will have to wait for the Experimental Versions next version of the error fix.
or someone tell me how solve ways. (Nepster told me)

bcoz Experimental Versions can't run before install Halloween 2017.
- Error message (on Windows 10).
"Exception EPngError in module NeoLemmix.exe at 0026A6DA. Not a vaild PNG file."

I enjoy played Stable Versions V10.13.18

Stable Versions can runing , no problem , this version need *.nxp. (very simple and easy)
but other *.nxsv can't run without *.dat. (I don't know where is *.dat)

I think Halloween 2017 release *.nxp version better for beginner.

I don't know how to install?

Under my step

1. install NeoLemmix 11.15.21
( why can't runing this , I think first problem can't run stand only)
I got message -> An error occured while trying to save data.
I did make save directory.
and next error -> Exception EPngError in module NeoLemmix.exe at 0026A6DA. Not a vaild PNG file.

2. unzip Lemmings_Halloween_2017
still same error message. can't play now

How to solve this problem?