This converter use free API with 1000 request per month If you need more you need to subscribe hire https://fixer.io/ for 10$ 10 000 requestst.Also need to register and take api key from site is free.and change in convert.php line 209
$url = "http://data.fixer.io/api/latest?access_key='Your API KEY Here!".$base.'$symbols='.$currency;
API KEY must be without quotes.
api key(not active) : be5a3aa9b5a7e51ba5dc9b0995te761b
free unlimited API requests
set up the form on your web sites
upload the files into your web site
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A regular license allows an item to be used in one project for either personal or commercial use by you or on behalf of a client. The item cannot be offered for resale either on its own or as part of a project. Distribution of source files is not permitted.
An extended license allows an item to be used in unlimited projects for either personal or commercial use. The item cannot be offered for resale "as-is". It is allowed to distribute/sublicense the source files as part of a larger project.