As  far as I can remember, because FSX-SE is the only version of FSX installed on my laptop (both FSX and FSX-SE are installed on my PC), it installed directly into FSX-SE.

If I look at the %AppData\microsoft folder on my laptop, I find an FSX folder in there, and not an FSX-SE folder (on my PC I do have both), so FSX-SE is seen as FSX. Also, on my PC, any Captain Sim 32bit product that isn't made for both FSX, and FSX-SE, has to be copied over to FSX-SE. However,  if I uninstall it from FSX, and then install it again, I can change the destination to the FSX-SE  folder  (E:\SteamLibrary\steamapps\common\FSX), and install it directly into FSX-SE.