National Instruments normally provides ample notice before discontinuing a product.
As mentioned in several places on this Forum, the DASYLab software is not actively sold by National Instruments nor is it directly supported by National Instruments.
If you have specific concerns about the product, you should contact your reseller directly. They are best equipped to talk to you about the product.
Measurement Computing (MCC) has free technical support. Visit
www.mccdaq.com and click on the "Support" tab for all support options, including DASYLab.