XC 5.3.5.3 and many associated modules have now been released via Merchant wave. The upgrade process ran fine for us with no problems, but now we'll need to dev store test everything, including all of our own modifications etc before taking this live.
FWIW. If you
are still planning to run the XC GDPR Module on your store, at the time of making this post, we double checked and it still says
"...Compatible: 4.5.x - 4.7.x, 5.3.4.x Don’t see your version? Contact us..." So XC will either update the module and / or correct this text validation soon, but if you're keen to use this module, upgrade to 5.3.5.3 and use everything live , you may need to choose which comes first.... until XC tell us more...