Hi boskar,
Thank you for supporting RadiAnt and purchasing the license.
There is some info about activations here:
https://www.radiantviewer.com/dicom-viewer-manual/activation.html
1) Yes, a license can be moved to another PC only after 90 days passed since last deactivation.
2) There is a limit preventing more than 2 deactivations on the same computer.
3) Yes, the above limits are the same for subscription licenses.
4) This question is answered in 2)
5) If there is an "emergency" and the customer cannot deactivate the license because of the limit we are always willing to manually release the license (unless there is some clear abuse attempt, which is almost always not the case).