Same problem. RiggsFolly dirrections did not work.
I did run deplister.exe on the file and got this:
C:\_Software\wamp\bin\php\php7.0.4>deplister.exe ext\php_intl.dll
php7ts.dll,OK
icuuc56.dll,OK
icuin56.dll,OK
icuio56.dll,OK
MSVCP140.dll,NOTFOUND
VCRUNTIME140.dll,OK
api-ms-win-crt-heap-l1-1-0.dll,NOTFOUND
api-ms-win-crt-environment-l1-1-0.dll,NOTFOUND
api-ms-win-crt-math-l1-
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