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The design provisions and load combinations from the Uniform Building Code (UBC 1997) are no longer available. Since the IBC and ASCE 7 now have identical load combinations, the Load Combinations from… selector has been removed from the program.
UBC designs made with previous versions of Sizer still designs using UBC load combinations and provisions. To change to IBC/ASCE 7, it is necessary to open a version of Sizer 8.3 or before, change to IBC, and save the file.