Touchdesigner.exe will run in task manager and immediately close (in around 1 second) upon Start. Have tried updating, 4 reinstalls of newest and earlier versions, updating Nvidia driver to most recent version, updating intel and windows versions, etc. It worked before I moved cities, haven’t used my PC in a while. Really need this. 
INFO:
TD: 2020.26630
WIN: 10.0.18363
How to debug TD startup failures is explained on this wiki page: Using WinDbg to Debug Crashes - Derivative
Thank you. Here is my receipt for support personnel (after 3 attempts at Go launch):
10f8.1460): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
0000000000000000 ?? ??? 0:000> g (10f8.1460): Access violation - code c0000005 (!!! second chance !!!) 0000000000000000 ?? ???
0:000> g
(10f8.1460): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
00000000`00000000 ?? ???