Extract the RAR contents using tools like 7-Zip or WinRAR. Look for a file named update.zip or similar. Do not leave the final update file inside the RAR archive.
Since official downloads for specific identifiers are often provided through regional Blaupunkt Support Portals, follow these standard procedures: Download BLAUPUNKT 194G FTCU 194G FTCU RAR
Are you attempting to or are you looking to upgrade the Android version of your device? How To Update Your Android Head Unit + Apps Extract the RAR contents using tools like 7-Zip or WinRAR