I bought an SSL certificate from DigiCert with EV Extended Validation. Do I need to switch to a business tariff plan to install it? There are no other ways?
If you want to use a custom certificate you must be on a business or enterprise plan.
EV certificates are essentially useless at this point, as the major browsers no longer give any indication such as the green bar. Scott Helme as a few blog posts about this.
Exactly what michael said, I myself got an EV as well and asked for cancellation once I realized how expensive it was to use with Cloudflare and the downsides it involved with the verifications Comodo does.