The last version to be tested on Windows XP is version 3.0.1, released in March of 2014. Windows XP support was offically dropped with 3.1.2 in January of 2016, however newer version would continue to run, alebit with some features disabled and no assurance that those features remaining wouldn’t cause problems. This held until the recently released 3.2.8, which increased the minimum system requirement to Windows 7 SP1.
Generally speaking, we don’t continue to offer older versions for download. Some third-party mirrors may still have 3.2.7 available.