The ornamental design for a slidingdoorinstallationassembly, as shown and described.
FIG. 1 is a front view of a sliding door installation assembly showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is an enlarged left side view thereof;
FIG. 4 is an enlarged right side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is an enlarged view of the indicated portion in FIG. 1;
FIG. 8 is an enlarged view of the indicated portion in FIG. 1;
FIG. 9 is an enlarged view of the indicated portion in FIG. 2;
FIG. 10 is an enlarged view of the indicated portion in FIG. 2;
FIG. 11 is an enlarged view of the indicated portion in FIG. 6; and,
FIG. 12 is a front view thereof showing the sliding door installation assembly in a position of use with a sliding door installed.
The broken lines in the drawings depict portions of the sliding door installation assembly that form no part of the claimed design. The additional broken lines in FIG. 12 depict environmental subject matter that forms no part of the claimed design.