Ok this is not pretty but well no one else seems to find anything either.
30. R4C4: no 7
30a. R4C4 = 7 -->> R8C4 = 9 -->> R6C45 = {24} -->> R8C8 = 2 -->> R6C6 = 1 -->> R3C6 = 4 -->> R27C6 = {26} --> R1C6 = 9 -->> R5C6 = 8 -->> R5C7 = 9
30b. R4C4 = 7 -->> R7C7 = 9
30c. R4C4 = 7 leads to 2 9's in C7, so R4C4 can't be 7.
31. 7 in N5 locked for D/
Para
Killer-X
36. Hidden Pair {12} in R4C4 + R8C8
37. R8C2: no 9; sees all 9's on C4.
38. R8C2 = 3
39. R1C5 = 3 (hidden); R2C5 = 7
40. R8C1 and R7C7 both {79}. See all 9's in N1. So they can't both be 9. R1C1: no 7.
41. 7 locked in R1 for N3.
42. Naked Pair {49} in R1C1 + R1C9: locked for R1 + R9C9: no 4.
And now the rest is all hidden and naked singles.
Para
37. R8C2: no 9; sees all 9's on C4.
38. R8C2 = 3
39. R1C5 = 3 (hidden); R2C5 = 7
40. R8C1 and R7C7 both {79}. See all 9's in N1. So they can't both be 9. R1C1: no 7.
41. 7 locked in R1 for N3.
42. Naked Pair {49} in R1C1 + R1C9: locked for R1 + R9C9: no 4.
And now the rest is all hidden and naked singles.
Para