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Calibre 6 doesn't really change that much, it just requires updates to all plugins (both my ACSM plugin and the DeDRM plugin) because of a QT upgrade.
As DNSB already wrote, check if the ACSM file turns into an EPUB/PDF and you just get the "This book is protected by DRM", or if the ACSM file imports as-is and fails to turn into an EPUB or PDF.
In the first case, you'll need to ask on the DeDRM Github page. In the second case (or if you're unsure), you can post a log file here and I'll take a look.
Just click on the drop-down arrow next to the "Preferences" button, then click "Restart in debug mode". Once Calibre restarted, import the ACSM file then close Calibre. A text editor should then open with a log file that you can post here.
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