I've tested this helpdesk and was really pleased with it and it was in my top-3 list. We ended up with Zendesk but that was only because of the ability to create and write custom apps inside Zendesk, like displaying additional information about the user as a panel next to the ticket. If we will decide to go from Zendesk to another helpdesk platform, will consider JitBit again because they are not limiting file size for email attachments like Zendesk is doing.
Are there any prerequisites to the web pages for it to work?
I use the on-prem version in many different variations.