On July 15, the Kentucky State Board of Elections released new registration data, which it does every month. For the first time, there are more registered Republicans than Democrats. Here is a link to the totals. There are 1,612,060 Republicans, and 1,609,569 Democrats.
The percentages are: Republican 45.19%; Democratic 45.12%; Libertarian .42%; Green .06%; Constitution .03%; Socialist Workers .01%; Reform .004%; independent and other 9.16%.
On October 10, 2020, the percentages were: Democratic 46.91%; Republican 44.00%; Libertarian .38%; Green .05%; Constitution .03%; Socialist Workers .01%; Reform .004%; independent and other 8.63%.