A startup crash can occur when the machine.config has the following entry:
<NetFx40_LegacySecurityPolicy enabled="true"/>
If that's the case, set enabled to false:
<NetFx40_LegacySecurityPolicy enabled="false"/>
To locate your machine.config, check out this StackOverflow article:
https://stackoverflow.com/questions/2325473/where-is-machine-config
Should you still experience startup crashes, feel free to open a support ticket:
https://www.royalapps.com/go/support-ticket-new
Note: this applies to Royal TS V5.x or lower.