What you get when you download the MathType 5 evaluation...
The version of MathType you can download from this page
is exactly the same as if you had purchased MathType, but you simply click
on the Trial button when asked for a registration number during the installation
process:

What to expect after installing the evaluation
You will have 30 days in which to enjoy all the features
of MathType. At any time, before or after the evaluation period ends,
you can purchase a valid registration number by going to the Design Science
web site at www.dessci.com,
then click on Order Now under Sales. Even easier, from MathType's
Help menu, under MathType on the Web, choose Order MathType.
Once you receive a registration number, you don't have to re-install MathType
(although you can if you want to) just choose Register MathType under
MathType's Help menu and enter your new registration number to unlock
MathType.
What to expect when the 30-day evaluation period expires
If you do not purchase MathType within the 30-day evaluation
period, MathType will go into MathType Lite mode. In this mode,
MathType works much like Equation Editor but, as an added bonus, you will
continue to have access to the full set of MathType fonts and symbols!
Even after the 30 days are over, you can still unlock your copy of MathType
at any time by following the instructions in the last paragraph.
All my friends want to try MathType
Feel free to send a link to this page to your friends and
colleagues, so they can try MathType for themselves.
I want to start evaluating MathType now!
So that we can keep you up-to-date on the latest developments in our
product line, we request that you enter your email address here before
going to the download page. From time to time we'll send you information
related to our products but will not use your email address for any other
reason. Your information will be treated securely.
Download EstimateFile size: 9.75 MB
23 minutes and 47 seconds. [56Kbps]
2 minutes and 5 seconds. [ADSL/Cable 640Kb]
1 minute and 20 seconds. [T-1]