Problem with winrar files

[Timba1604]

Only happened now with 2 titles that i decided to download, both being from the ley line trology, being them the first and second. am receving a message saying while trying to open the file that it is either damaged or in a unknown format, and the size of the files after downloading does not correspond with the download size before. tried searching online but couldnt really find anything

[kn1000a]

1. redownload the archives, your internet might've been interrupted so the archives are corrupted

2. preferably use 7-zip, better .rar manager