For what it's worth, I'm using calibre 6.40, ASCM 0.0.16 (the author is dropping the De from the from of the name to match with other input plugins such as KDP Input, KePub Input, etc and noDRM's DeDRM 10.0.3.
When you import an ACSM file, does it show as an ePub in calibre's library? That will let you know if the ACSM input plugin is functioning.
Note that removing DRM only occurs on import to calibre and you need to have the correct information in DeDRM. For more help on DeDRM and configuration, see
Discussions on the github NoDRM site.