I will share my setup:
I connect the PS4 directly to the pc through lan cable. On PS4 network options you have to set it for LAN.
I use an old remote play pc app that works with my 5.05 ps4 without having to update, and then use the offline remote play patcher on the remote play install file (google about this)
If everything went well you should be able to run remote play pc and ignore the update prompt.