installed neoload successfully
imported certificate from C:\Users\<user>\AppData\Roaming\Neotys\NeoLoad\v5.2\conf
to Trust
cannot record any application
A certificate issue should not prevent you to record any applications. I guess your recording issue is not completly caused by that.
You should check while recording with NeoLoad if your proxy browser is "localhost:8090" which is the NeoLoad proxy.