Upgrading 3850 stack 16.6.x (bundle) to 16.9.x (install) FAILS

The problems I've been facing

1. the boot system was set to packages.conf, on both switches it was for different versions. Is there a command that will copy the .bin file to flash on all the stack switches? I used the following **Switch# copy tftp://10.76.76.160/cat3k_caa-universalk9.16.09.04.SPA.bin flash:**
2. I'm using **Switch# request platform software package install switch all file flash:cat3k_caa-universalk9.16.09.04.SPA.bin new auto-copy** to install the target image to flash. Is this correct command ?
3. Should i convert my 3850 16.6.x from bundle to install as a first step. And then upgrade to 16.9.4?
4. I use **boot system switch all flash:packages.conf**. Do i need to use .bin file here?

Edit: formatting