Hi there,
Thank you for your interest in hosting with us. I will answer your questions accordingly below:
1. We can definitely install clipshare out of the box for you. Please select either our Fully Managed or Custom Software Installation addon at the checkout. Once you have completed your order, you can create a ticket requesting clipshare to be installed on your server. Please prepare your Clipshare and a copy of the software for our engineers to install for you.
2. We are currently only accepting monthly payments.
3. Here is our test file, 48MB:
http://www.vitalservers.net/test.zip
Please let me know if you have any further questions. I look forward to see your order so I can help expedite it.
Richard