I have just spent a whole day getting my first LPC5502 project working.
Installed SDK - wouldn't work on MCUXPRESSO 11.1.1 -- Upgraded to 11.4.1 - then the peripheral views wouldn't work - reinstalled 11.1.1, which fixed the peripheral view, but the SDK didn't work and couldn't be deleted.
The Windows version of 11.4.1 will not communicate with the LPC5502, giving a "No SWD devices" error, the Linux version doesn't communicate with anything giving a "Internal: unable to find DFU-UTIL" error.
What's missing?
11.4.1 on the old computer (Linux) will communicate with the 5502, but I cannot see any of the peripherals.