When it starts to download the 'Data version.json' file a message is showing up:
Processor failed, invalid outputs:
C:\Users\filip\AppData\Roaming\.minecraft\libraries\net\minecraft\client\1.14.4\client-1.14.4-slim.jar
Expected: db1f32cac159af8a5fb4e805e6c2b880388782a5
Actual: c174844daed9f157081477540e36a5eb4932753f
C:\Users\filip\AppData\Roaming\.minecraft\libraries\net\minecraft\client\1.14.4\client-1.14.4-extra.jar
Expected: 4ccc85c80f9ed2827c8351c3aff29a12df6f7951
Actual: 7ad823711253f489a26fc08c39dc7762db1fe931
It makes then unable to continue installing. I think it's just a bug. Can you repair it please?