Please see UWindsor campus map / CEI floor maps at the bottom of the page.
SAC 2022 parking: a paid parking garage across California Ave from CEI (google maps)
Two entrances to the garage are located on California Ave and Sunset Ave.
The ticket machines are located at the northwest exit (ground floor) and the northeast exit (second floor).
If the arm barrier at the garage entrance stays vertical, then you are lucky - it's free.