Try using https://freessl.space
Here is a guide on how to use it by Hostranavt
Instruction on CNAME verification on inifinityfree:
- Go to your vPanel => SSL/TLS => Configure SSL => Generate Key/CSR
- Fill the form, than copy CSR request
- Go to freessl.space, enter your domain.
- Tick “I have my own CSR” and paste your CSR.
- Choose DNS method.
- Set the CNAME record in vPanel and click Verify domain. Notice: it may not be verified from the first attempt, wait for the second one.
- Certificate is ready, copy Your Certificate code into SSL/TLS in vPanel.
Enjoy! 