It is the discretion of the MOD author whether or not they wish to support their MOD -- they are not required to. Any form of support (be it paid or otherwise) is a service offered to the community above and beyond what is required
The time commitment in programming a MOD of this magnitude is quite large in and of itself (and it is being offered for free no less), so frankly there's nothing wrong with wanting to receive a bit of compensation for supporting it. You're using the MOD and taking further time from the author by requesting support, a small monetary donation isn't unreasonable to ask for.
if some one wish to donate then it's ok but by saying that we 'll not support without getting money is bad.
because Phpbb is free and open source therefore all of it's mods should have same policy!
like we can donate to phpbb but we are not forced to do it, or phpbb does not say that we 'll provide no support without money.
installing a mod like this without any support is Risk and can cause waste of time.
not all users can pay what he is expecting, just imagine i installed this mod and it's giving me some error, i don't know what to do and mod author is also not supporting.
so, in case anything goes wrong and mod author does not support, what's it?
waste of time
board 'll remain offline until problem is solved.