I have installed an old copy of microtonic (need to open old projects), but it is impossible to register using my purchase details. Tell me to contact nuedge development.
I first purchased microtonic in 2008
what can i do?

Which exact version are you trying to install? The latest version of Microtonic should be backwards-compatible all the way back to version 1.0.

Very old versions used a different registration key scheme. If you still need to install one of those versions, please contact support@soniccharge.com so we can look up your old key.