First of all make sure you have the correct version of gcc installed, the installer that you downloaded asks for version 10.
Second, try installing all prerequisites first and then rerunning the installer-script afterwards.
If that does not help, please check the output of otool -L SCIPOptSuite-7.0.2-Darwin/bin/scip
and echo $DYLD_LIBRARY_PATH
to see if the library in question is loaded.
Lastly, you can try to patch the binary by adjusting the path to the library for the correct one:
install_name_tool -change /usr/local/lib/7/i386/libquadmath.0.dylib /usr/local/Cellar/gcc/10.2.0_2/lib/gcc/10/libquadmath.0.dylib SCIPOptSuite-7.0.2-Darwin/bin/scip
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