What if the number of decompilers I use with a perpetual IDA license does not match the number of decompilers available in subscription plans?

For example, I use 5 decompilers, but you only have plans for 4 or 6 decompilers?

You have the option to migrate your perpetual license to a subscription plan which includes one more decompiler (i.e., Expert-6, if you need 5 decompilers) at the cost of the plan with one less decompiler (i.e., Expert-4) until the end of your current support period / subscription period.