There is no official course or tool from OffSec (formerly Offensive Security) called "OSCP Fix." Based on recent course updates, it is likely you are referring to the major which replaced the standard OSCP with OSCP+ and introduced significant "fixes" to the exam structure to address modern penetration testing needs . The "OSCP+" Overhaul (2024-2026)
Before you ask for a hint, run this mental fix: offensive security oscp fix