This specific version is an older maintenance release of the 2019.2 major version. PyCharm 2019.2.4 - The JetBrains Blog
The "XYZ" suffix often appears in files distributed through unofficial or third-party sources, which frequently provide "cracked" or pre-activated software. PyCharm Professional 2019.2.4 Overview PyCharm.Pro.2019.2.4 - XYZ.rar