Can't run Newest versions since 4.21.Erorr Code LS-0013

Hello People. I keep bumping into this problem since 4,21. I am still using 4.20 cause I had no chance to install and launch properly new versions.
When I try to run the Editor it stuck on 45% and no shader compile task in the Task manager.
Even I verify instalation, it still show me the message with the LS-0013 Error code.
I try everything written in forums from threads with the same issue but no result.
Please any suggestions. Here is my specs! I know my Pc is not very good for UE4.But is working fine with older verssions.

Graphics Chipset - AMD Radeon R9 200 Series
Memory Size - 3072 MB
Memory Type - GDDR5
Core Clock - 940 MHz
Windows Version - Windows 7 (Service Pack 1) (64 bit)
System Memory - 20 GB
CPU Type - Intel(R) Coreā„¢ i5-4670K CPU @ 3.40GHz