v0.5.2 — fix InstallerVersion + README pin references

MSXCP v0.5.2

SHA256 of installer zip: B2A46FBBB6EC56B0945172A226C27EF40A97B544D880FDD3C7DAE77F068FD5E0

Install via the bootstrap one-liner — see the README.

Full Changelog: v0.5.1...v0.5.2