What is the maximum allowable softphone installs on an account with 5 paid users?

I am trying to install an RC softphone app on my home Mac (ver. 20.2.2.39769). During the installation process, I get an error message that I have reached the maximum number of allowable installs. We have 5 paid user extensions and 4 have softphone installations on each desktop computer in addition to individual YealinkT48S desk sets. I would like to install RC softphone app on my home computer as well as on my iPhone. What is the maximum allowable softphone install on an account with 5 paid users?