In IAR Embedded Workbench for MSP430 version 5.10 and newer, the "Windows driver package" (umpusbvista) for the FET-USB is used.
That USB driver is incompatible with IAR Embedded Workbench for MSP430 version 4.21 and older.
The USB driver installed by IAR Embedded Workbench for MSP430 version 5.xx can be uninstalled and replaced by the USB driver from 4.xx.
...Windows systems that are 64-bit. All 64-bit systems must use the "Windows driver package" (umpusbvista) USB driver. (That is, the driver installed by IAR Embedded Workbench for MSP430 5.xx).
Yes. On a 32-bit Windows system, the old USB driver will work with the newer IAR Embedded Workbench for MSP430 version 5.xx.
Yes, this is the correct behavior. The FET DLL file(s) for 4.xx and 5.xx are different, and thus the firmware must be updated for each change between 4.xx and 5.xx.
Yes and no.
No, the driver will not be removed as long the computer is not changed.
Yes, the driver will be removed if IAR Embedded Workbench for MSP430 5.xx or a newer version is (re-)installed. (It is part of the installation to replace the USB-driver with the more modern "umpusbvista" driver. If the driver was updated, perform the steps in this Technical Note once again.
All product names are trademarks or registered trademarks of their respective owners.