Materialise
If you had a License for the Slicer, originally delivered, and need assistance with that, please contact
https://www.materialise.com/en/get-in-touch

If you still have the Voucher, you can reactivate the License here:
Password site


Alternatives

For Slicers in general, there are many options, like Cura, Repetier, Simplify3D and others, compatible with the Creatr Product Range.