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[Elesty]

The alternative is to use online license servers (Google for "idea license server").
New versions seem to block the known online URLs.

As workaround, reverse proxy such as nginx can be configured such as below (set hxxp://localhost:8888 as license server):

server {
listen 8888;
server_name localhost;
location / {
proxy_pass HXXP://LICENSE_SERVER;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Port $server_port;
}