R - added downgrade option
Added DOWNGRADE option as Maths existing version number is 3610 for v3.6 therefore when moving to UCAM where version is v4.0.0 a downgrade option is needed.
Added DOWNGRADE option as Maths existing version number is 3610 for v3.6 therefore when moving to UCAM where version is v4.0.0 a downgrade option is needed.