We're sorry about the trouble with Photoshop. Would you mind telling us what you mean by Neural filters not being active in the application? Are you not able to locate the option or is the option greyed out? Which version of Photoshop are you using & which macOS version are you working on?
Selecting Neural Filters opens the dialogue box but, although tantalisingly there, all beta options fail to activate. "Smart Portrait" cannot be turned "ON" and most other filters give an explanation of the effect but only allow me to confirm that "I'm interested".