I received a response from support, and they finally gave me a key. Now the question is how to combine rsa private key with a certificate? When I tried to do it myself, I failed. I also want to provide all the certificates here (they are openly available and everyone can download them, so I don't see anything criminal here) (I followed this instruction https://forum.goldenfrog.com/t/aes-ni-gcm-support/824/6)
/etc/ipsec.d/cacerts/goldenfrog-ca.crt (I downloaded this certificate from this link https://support.vyprvpn.com/hc/en-us/articles/360041273371-Where-can-I-find-your-CA-certificate-)
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
/etc/ipsec.d/certs/goldenfrog-client.crt (i download this here (https://support.vyprvpn.com/hc/en-us/articles/360038093771-VyprVPN-IKEv2-Setup-for-Windows-Phone-8-1)
Bag Attributes
localKeyID: 5F D4 53 C1 E0 DA E6 87 3A 9D 74 9C A4 5C F3 3A 8F 89 44 26
subject=C = CH, ST = Lucerne, L = Meggen, O = Golden Frog GmbH, CN = goldenfrog-client, emailAddress = admin@goldenfrog.com
issuer=C = CH, ST = Lucerne, L = Meggen, O = Golden Frog GmbH, CN = VyprVPN Intermediate CA, emailAddress = admin@goldenfrog.com
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
/etc/ipsec.d/private/goldenfrog-client.key (i download this here (https://support.vyprvpn.com/hc/en-us/articles/360038093771-VyprVPN-IKEv2-Setup-for-Windows-Phone-8-1)
Bag Attributes
localKeyID: 5F D4 53 C1 E0 DA E6 87 3A 9D 74 9C A4 5C F3 3A 8F 89 44 26
Key Attributes: <No Attributes>
-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----