ISTRAXX Download plugin - Maximum number of downloads reached Maximum downloads

[rcatena]

Hello
we have a problem with plugin
"VM - Custom, iStraxx Download Plugin for media for Sale"

to downlaod pdf file after confirm payment

the link to download file show always the same message:

"Maximum number of downloads reached
Maximum downloads 1 in interval 1 reached"

The configuration pdf file is set:

Download gratis   NO
download massimo   10
Download massime per l'intervallo in giorni   10
Intervallo in giorni   10
Numero massimo di giorni per il download dopo il primo download   10
Pubblica alla data   -/-/-
Annullare la pubblicazione alla data   -/-/-

Version:
Joomla 4.4.13
VirtueMart 4.4.10 11120

Thanks for your suggestion.
Roberto