Crashes can be due to a damaged file and crashes can damage a file. For both reasons it's a good idea to run a recover on your file to check it for damage.
To rule out file damage as a possible issue, I'd create a brand new file with just enough elements to recreate the same Install OnTime with Insert From URL setup and run it for an extended period of time to see if it also crashes.
If the new file crashes, I recommend reporting this as a possible software bug in Report an Issue.
I tried a simple script but some time later it too crashed the machine during a transfer necessitating Task Manager to force close the program. Interestingly Task Manager informs that the program was waiting on a response from user.
I'm trying the DB on a different machine to try and rule out any other conflicting software.
Thanks for your help.