Welcome to DeepSkyStacker 4.1.1
We've fixed a number of problems since 4.1.0:
The 32 bit version has been changed to build the zlib code without the optimising "asm" option to fix a crashing problem ("asm" is not officially supported in zlib and has not been maintained)
The 64 bit version has been changed to build the zlib code without the optimising "asm" option as a precaution (the 64 bit version wasnt crashing as far as we know but as the "asm" option isn't officially supported we have elected not to use it)