If you set BWS to "pause after downloads" and at that time manually extract the resource fixer into the game directory, that might satisfy BWS' mod presence test and allow the install to proceed.
How does BWS work ? because they are other conflict later in the install, about 5 mods preselected by the recommended auto-install are presented incompatible. Is it because the CA install wasn't update for a long time ? If I ignore all the incompatible mods, and continue the install, do you think that the game would run properly ? Or should I just install the CA mod without BWP, and in this case, why is the CA install in BWP still present ?