Sideload install custom ROM

I have TWRP on my bacon (OnePlus One).

I decided to install new custom ROM and try Carbon. I pushed the zip file to device, then rebooted to TWRP

adb reboot recovery

and decided to completely wipe the phone. I had a lot of files "orphaned" from some old apps and wanted to get rid of all of them.

Then I realized, that the zip image was also deleted. And in bootloader, adb push does not work. So, what did I do?

1. In TWRP I went to: Advanced > ADB Sideload > Swipe to Start Sideload
Now, if I type

adb devices

I get my device in sideload mode.

2. Typed:

adb sideload .\CARBON-CR-7.0-OPAL-RELEASE-bacon-20200526-1945.zip

and the ROM was installed. Then I installed GApps the same way.