The latest version of MRCC is released on December 31, 2024.
The important new features and changes are as follows.

1. Density-based basis-set correction for CCSD(T). https://doi.org/10.1021/acs.jctc.3c00979

2. Density-based basis-set correction for local natural orbital (LNO) CCSD(T) [LNO-CCSD(T)], complementary auxiliary basis set (CABS) singles correction for HF energies using local density fitting approximation. https://doi.org/10.1021/acs.jctc.4c00777

3. Density-based basis-set correction for higher-order CC methods. https://doi.org/10.1016/j.cplett.2024.141780

4. Restricted open-shell LNO-CC methods via localcc>=2024: highly-optimized, OpenMP-parallel LNO-CCSD(T), and LNO-CC with open-ended CC. https://doi.org/10.1021/acs.jctc.3c00881

5. Minor modifications of closed-shell LNO-CC (localcc>=2024) for consistency with open-shell LNO-CC and for improved accuracy with non-atom-centered basis sets (e.g., ghost or floating AOs).

6. Extrapolation and composite energy expressions for LNO methods, benchmarks, and practical applications are reviewed in https://doi.org/10.1039/D4SC04755A.

7. Reduced-cost explicitly correlated MP2 approach. https://doi.org/10.1080/00268976.2024.2304103

8. Analytic gradients for the Huzinaga quantum embedding method. https://doi.org/10.1063/5.0194463

9. Analytic gradients for density fitting MP2 using natural auxiliary functions. https://doi.org/10.1021/acs.jpca.4c02822

10. Improved explicitly correlated CCSD(T) program.

11. Double hybrid DFT functionals with explicitly correlated MP2 correlation.

12. Local second-order algebraic-diagrammatic construction method [ADC(2)] for core excitations.

13. Dyson orbitals for ADC(2)-based IP and EA calculations.

14. Significantly improved algorithm for ADC(2)-based embedding calculations.

15. A couple of bugs have been fixed, and the manual has been improved.

It is recommended for every user to upgrade to this version.