about a month after i posted this, QB offered and update or the sonoma did, , i cannot rembmer, and i was able to log in agian.

for about a month, I needed to use my back up old mac, to. log into my accounts online, i would make sure your files are stored in drop box or google drive,,.  KEep a copy of your software on a back

up computer if you have one,  and then update your primary software, ,.  

sharon37, so should I update my QB Desktop Mac 2021 first?

i would not . it may charge you an annual fee. not sure which versoin they are cutting off service for but i would not. i have 2019 and will be able to use it after QB stopps supporting QB desktop. so be careful

@neverstoplearning 

You can update your OS to Sonoma to run QBD 2021. Make sure you are not tempted to upgrade your OS to a newer OS later.

Why doesn’t QB care about very small businesses like me? I am a customer of Qb since 1999. I have a Mac desktop, that I can not update due to having QbD2019. I don’t have payroll, I only use AP/AR. I do only 4 AP a month. I do AR once a year (dues) . I can not or need a monthly or yearly ($600) subscription. 
It was the small businesses that really started Qb up back in 1999. 

@ER674 

As I know you can still run QBD 2019 on Sonoma. Did you encounter any issue?