This is the tactical speed file patch to provide the slower speed files for 7 series GES 7K420T-2 devices for ISE Design Suite 14.6 (P.68); see the link at the end of this answer record.
Applying the Patch
The patch can be applied to ISE design tools using the MYXILINX environment variable, or to the Vivado tools using the MYVIVADO environment variable.
MYVIVADO is used in the same way as MYXILINX.
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