You need to upgrade APICs to the same or higher version than the switches. To be able to download the APIC firmware, you need a valid contract with Cisco through a Cisco channel partner.
The best thing to do is to discuss the situation with the available Cisco channel partners in your region/country, so that they provide you with an offer to include all ACI hardware - if possible - in a support contract. It might not be cheap, but it is cheaper than having your production ACI fabric go sideways right before payroll day.
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