Why do you download its new versions? Don't you know that the advantages of the new updates of WinRAR are the multithreating technology, so go to buy another PC with a multicore processor so it will work even better.
The program is better with version 5 and the RAR5 format compresses better and faster. RAR5 uses more RAM if the directory size is big, so old computers beware. Default directory size is OK for old PCs.
But popup license window sometimes bored
But I really use it - small & fast.