How about the 6 machine which I can’t install the Enterprise Edition due to Licence limit?
Ah… now I understand the question 
The issue is, there is no way to sync macros that are stored inside the HTML5 storage automatically. Of course, you can always export and import macros manually.
I would recommend to purchase more Enterprise licenses, this makes everything very easy. If you simply need to replay macros on the 6th (and more) machines, I recommend the so called RPA Player License, it does not cost much:
It gives you an unlimited license to run your macros and testsuites on as many machines as you need - inside or outside your company or organization.
The UI.Vision RPA Enterprise Player has all features of Enterprise Edition , except the ability to create new macros. Technically speaking if UI.Vision RPA XModules are unlocked with the Player license key, the “Save” button is disabled. Everything else works 100% as in the regular Enterprise Edition. The number of included OCR conversions is 10,000 per day per Player license (additional conversions can be purchased any time).
You can fully sync macros between the Player license and regular Enterprise license. It is all the same.