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?