i also have an original aweb,install aweb3.5apl into the same folder, no problem.you need to have an original aweb to use all the plugins from 3.5apl.
read the readme file in the plugins drawer to edit the buttons & plugins? eg: go to aweb drawer storage/buttons, select the button set you chose ,from the pulldown menu info.edit the tooltypes, delete TRANSPARENT save & exit.
next, open aweb,settings/browser settings /viewers scroll down to find the new plugins gif/jpeg/png, select each in turn, edit the PROGRESS=O HIT RETURN,save & exit.
this cures the messed up graphic buttons.