Can't install on macbook

hello. 

i have macbook pro 15inch. 2018

I'm using High Sierra and I can't give up on High Sierra. This is because we use programs that support updates up to High Sierra. If you install a higher OS than that, this program will have problems. So, my teammates are all using High Sierra.

Now the problem arises here. The same team member is using the same 2018 15-inch pro model as me, and the OS is also using High Sierra. But on that MacBook, you can install the 2020 version using Adobe Cloud. Why can't I install the same OS version?

I already know that other versions can be installed in the cloud, but only on my MacBook, the button doesn't appear and the message 'Not compatible' appears. Both MacBooks are the same High Sierra (10.13.6) version. how can i solve this problem? I hate to use the 2019 version by paying a monthly subscription fee. I want to use at least version 20. I guess it's because the old version download link only had until 2019, but 2020 can be solved within the cloud app.

help~