@Kevin_Z I updated it & now version is 1.1.0 build 20190731 Rel. 41250 & it is up to date

I purchased TP-Link | AC750 Wifi Range Extender RE200 from one year & I plan to change main router to TP-Link Archer MR600 4G+ CPE Router which support OneMesh Should I change the extender & buy new...