Unfortunately, because of several factors, it is no longer possible to install old Osclass versions (and locations). I have noticed and mentioned that here:
https://github.com/osclass/Osclass/issues/2238 (it is highly unlikely that it will happen again because now we have a skip option).
Geo API is changed, so it no longer works like that, and some other things as well. You may try to manually update installation code from latest versions, but there's a lot you have to change, and almost no one will have much interest in doing that I'm afraid; using old versions is highly discouraged because of vulnerabilities and bugs, except for testing and special cases.
Anyway, to skip location step, open install.js file in \oc-includes\osclass\installer\ and remove this code:
if( $('#skip-location-h').val() == 0 ) {
if($("#d_country span").length < 1) {
$("#d_country").css('border', '2px solid red');
num_error = num_error + 1;
}
} else {
if( !$('#skip-location').attr('checked') ) {
num_error = num_error + 1;
}
}
Repeat installation procedure and you'll be able to click on next step.
You may try later importing location .sql file if you have it and see if that still works, as automated installation and download no longer works.
Regards
dev101