The biggest quality-of-life fix: pdb2idb now uses Microsoft’s new Symbol Server API on Windows, and cabextract is no longer required on Linux (native PE parsing handles compressed PDBs). It also caches symbols in ~/.idapro/symcache/ across all three platforms.
The string likely describes a comprehensive update package that includes the core application for Windows, macOS, and Linux, along with its Software Development Kit (SDK) and various utility files. Key Components of this Version IDA Pro 9.1 ida pro 91250226 win mac lin ux sdk and utilities upd