MathCAD 15 install

I'm afraid this kind licensing crap is typical of PTC.

Here is what I agreed to w.r.t. the upgrade (which I haven't had time to install yet):

"Regarding Upgraded Use: If the Licensed Software was licensed as an upgrade from a
previous version, Customer must first be licensed for the Licensed Software identified by PTC
as eligible for the upgrade. After installing the upgrade, Licensed Software licensed as an
upgrade replaces and/or supplements the product that formed the basis of Customer’s
eligibility for the upgrade and Customer may no longer use the original Licensed Software that
formed the basis for Customer’s upgrade eligibility.
The undersigned certifies and agrees that they will, in accordance with the above, no
later than sixty (60) days after receipt of the upgrade, cease to use the software that
forms the basis of their eligibility for the upgrade, which are as set forth below, and
in no event will Customer use both the upgrade and the software that forms the
basis for the upgrade (except that, during the above 60-day period, Customer may
use the upgrade in a non-production environment to ensure its proper performance):"

So OK, it's an upgrade and we are supposed to remove MC14. AFTER 60 days. But it seems the installer forces you to remove it immediately! Like everyone else, I need to know MC15 actually works OK before I delete MC14.

Unbelieveable! At least, it would be if the company were any other than PTC.