If I buy astroelite, can I install it in multiple computers ? That is my desktop, Laptp etc. ?

All our programs comes with a single user license, i.e. licensed to one person. Read Terms of Service shown during installation for details.
There are up to three activation keys per purchase, therefore you may install the software on three computers. You may request activation of all three copies immediately or later on your choice.

If you selected an online activation, i.e. didn't ask for activation keys, you may activate the copies on any three computers at the same time and change (activate/deactivate) computers without limit.