Enterprise

[mohaoho]

iRed Enterprise Edition seems to have already been released. I wonder if the expert has any plans to continue modifying it.

[KW46]

Probably not.
1- marcus-alicia would need to buy an enterprise license
2- Legal mumbo-jumbo

Keep in mind that 'the expert' simply bought iredadmin pro ($499 !!!) and shared it here (with slight modifications; removed license check, few cosmetic changes) because the license allowed it. Better read the readme ;-)
Maybe if you can get in touch with marcus-alicia (eg Discord) and help pay, then it might be done. But even then, it is possible license is updated (especially since this repo was created) and no longer legally possible.
Although under iRedAdmin Pro the website still says:

The client is NOT allowed to redistribute or resell iRedAdmin-Pro (either as source code or binary packages) as your own product. Neither is the client allowed to sell a modified version based on iRedAdmin-Pro under the same name nor under a different name. It is for an authorized reseller allowed to resell the software if the final end client is mentioned in the order.

It also states a Commercial license is used, couldn't find a specific license though.

Anyway you're probably better off purchasing the product. (I would if I didn't use it for just home/amateur/hobby servers).
That being said, $499 for pro is quite pricey, but enterprise somehow is $15/mailbox/year (with a minimum of 10 mailboxes)..
$150 a year is actually worth it if frequently used, especially since it includes upgrades (for as long as subscription is active) and tech support. (And should you decide to cancel subscription, you can use it for as long as you want, you just loose tech support and the upgrades).

That $150 (10 mailboxes) is just for the first year, renewal's $60/year (renewal fee = 40% of initial fee)