I've deleted old device account before I've made backup on new one...help...

Hello,

I’m an idiot. I’ve made my old device backup and intended to download these data to my new mobile. Unfortunatelly, When I started to download saved data, I’ve found that I can remove old device from device list…and I did it. After that I’ve noticed, I have no possibility to download saved data…
Data is on google drive but how could I connect them with Avast Backup ?
Please…help…