TLP383 ltspice XVII model not working because of encryption?
You can't open a Pspice model in LTspice. I don't see any SPICE models other than the Pspice one in the linked site.

To elaborate, yes it's true that SPICE is SPICE and LTspice is perfectly fine with unencrypted models made in Pspice, but every Pspice model I've ever encountered has been encrypted. As is the case with this one--note how line 14 in the .lib reads **$ENCRYPTED_LIB.