Please note that the Renko indicator from this thread is obsolete. Please use the Renko view which is now available in MarketScope. For that go to the File menu and select Create View, in the Create View dialog box select RENKO_CANDLES and click OK. Then in the Renko Chart Properties dialog box set the parameters to values of your choice and click OK.
As to automatic refreshing, I guess that the cause of the issue is in the Brick size of the Renko chart. Please try to use less brick size. The smaller it is, the faster the chart refreshes. For example, set brick size = 5. Please try to change the brick size and let me know whether the issue is solved or not.