Matchcad 30 day trial / Express does no install I have downloaded the 30 day trial / Express installation program, from the link PTC sent.I am trying to install on:Dell Inspiron laptop with i7 processor, 64 bit, running Windows 11 64 bit. Hard drive is encrypted with Bitlocker. Usually runs Norton. There is > 10 GB free disk space. Windows Defender is not set to block any software. NET. Framework 4.8 or higher is already installed.There have been no previous versions of Mathcad / Prime on the laptop.A straightforward attempt at installation failed. No other software has every failed to install from my standard setup, including with Norton, Defender and Bitlocker running.Since then I have tried:1. Switching off Norton.2. Suspending Bitlocker.3. Testing with the Windows compatibility tester - it recommends changing setting to Windows 8, but it makes no difference if I do not change the compatibility settings, change to Windows 8, or go all the way back to Windows 7.4. Unpacking the installation files to an unencrypted USB drive (D: