Send your question
Quick Online Registration
It costs $23 to register XLink/Win online. You will require a valid credit card or Paypal account and an email address to receive your registration (see below for other payment options). To register your copy of XLink/Win online right now and receive your registration number immediately by email, click the Buy Now button above. This will take you directly to the FastSpring secure order page.
How do I pay?
Is it secure to pay by credit card online?
What do I receive?
What if I'm ordering as a gift for someone else?
How long does it take?
Why should I register?
Your small registration fee supports our ongoing development and helps to keep the price of the software reasonable. You can try the demo version of the program before you register so that you can be sure that it meets your needs. If you find the program useful, and you want to see it supported and upgraded in future, then please take a few moments to register your copy.
Can I upgrade from an older version?
If you have any other questions about registration, please don't hesitate to ask IMSL Software.
XLink/Win can be registered online with your Visa, MasterCard, American Express, or Discover credit card, or using Paypal. The registration fee is $23 for new users, or $13 for upgrades (U.S. dollars). You can register online with our online registration service FastSpring, which provides your registration number in a few minutes by return email if you are paying by credit card.
How to register: When you register online with FastSpring, you will be asked to enter your name, address, and credit card information (or other payment type) on the secure order form. In the order quantity fields enter the number of new or upgrade licenses you want. If you do not want to enter your credit card information online, you can telephone FastSpring, or send it to them by fax or letter. Upgrades are available only to previously-registered users of CASIF/Win or XLink/Win who already have a registration number. Please provide the optional information requested about your organizer and cable type if possible to assist in providing you with up to date information and technical support. If the credit card charge can be processed automatically, you will receive your registration number immediately in the order confirmation message. Please check the credit card information you enter carefully, as orders which are invalid for any reason may be held up for verification or automatically rejected. More information on credit card security and anti-fraud measures. The registration service will notify IMSL Software of your registration as soon as your order is confirmed, and you will receive your official registration message with additional information from IMSL Software by Email, usually within a few hours.
If you want to register an older version of CASIF/Win, just register XLink/Win and add a note that you want a registration number for CASIF/Win.
If you want to pay IMSL Software directly via Paypal, please send an email to email@example.com for the information you will need.
You can pay by mailing a check or money order for $23 to FastSpring (USA).
Normally you will receive your registration number by Email, so please include your email address.
For registrations sent by postal mail, you can receive your registration number promptly by Email if you send notice to IMSL Software that you have mailed your check. We ask only that you request your registration number AFTER you have mailed your check. A copy of the program on is available on CD by special request if you are unable to download it from the web site or receive it by Email.
You can register XLink/Win or CASIF/Win most easily by paying online with a credit card or Paypal. You can also pay by mailing a check. If you don't find a suitable option here, you can contact IMSL Software for country-specific information on other payment options.
Company Purchase Orders:Our registration service FastSpring will accept Purchase Orders from companies with qualifying credit. You can contact them by telephone or fax to arrange credit if your company is not already one of their pre-qualified customers. IMSL Software does not accept P.O.s directly.
Registration number doesn't work
Don't have a credit card
Delay processing order
Other problems: ask firstname.lastname@example.org . We will respond promptly to all questions.
All orders via FastSpring must be placed online. Order form supports selection of currency and language by country. Enquiries regarding orders can be made online or via email. FastSpring generally responds quickly, within 2 hours.
FastSpring accepts payment via Visa, Mastercard«, American Express«, Discover«, PayPal™, check, money order, or purchase order. Payments are accepted in five major currencies in addition to the US Dollar.
Security on the Internet: All credit-card registrations via FastSpring use secure encryption between the web site and your browser, and should be considered as secure as telephone or in-person credit card transactions. We do not recommend emailing credit card information, as email is not as secure. If you must use email, then always split your card number and expiry date between two separate emails. Credit card registrations are processed only by FastSpring, not directly by IMSL Software, so please do not email credit card information to IMSL Software.
If you have any concerns about using your credit card on the Internet, you can place your order by telephone or fax.
Anti-fraud measures: Credit card registrations are accepted from any country, but all credit card transactions are subject to rigorous validity and anti-fraud checking. If your credit card registration is rejected for any reason, please verify carefully the information you entered. Credit card charges can normally be processed immediately, but in some cases they may be delayed for 24 hours or more for verification. If your credit card order is rejected or delayed for reasons which you do not understand, then please contact the credit card processor (FastSpring) for an explanation.