I haven't used the free trials but it has kept saying it has expired

hi

I bought an used Mac a week ago and I tried to install free trials of some adobe programs.

unfortunately it said free trial had expired, at that time I thought it was my account problem so I created another account.

however it has kept saying free trial has expired even though I have never used it.

also it hasn't passed a week since I bought this Mac. ;(

I tried resetting 'host' following adobe homepage saying, but it doesn't work.

I cannot understand why it kept saying free trial has expired even though I've just created new account.

and by the way, I have formatted this Mac yesterday so I don't think there are any Adobe logs left on my computer.

I asked the seller if he ever installed that program on this Mac, he said yes.

if that is the problem, how could I solve this?

I asked support team for help yesterday, but they just suggested I use another browser.

I installed them with creative cloud, though.