Downloaded both of the Mac 2.0 files, and had a permissions issue with both. After debugging via "pkgutil --check-signature /Applications/SliceAndDice.app", looks like the signature is invalid.
Yup, can't launch the mac version here either. Can't wait to play the new version, so hope a fix is inbound soon!
I can launch it but it runs incredibly slowly
Try making the window a bit smaller, that fixed that issue for me on my 2015 MacBook.