"Portable" versions of paid software found in .rar archives are often cracked or modified by third parties. These files frequently contain malware, ransomware, or remote-access Trojans (RATs) that can compromise your system or steal data.
The file you referenced — “Adobe InDesign CC 2015 12.5.0 Portable -x86x64- .rar” — is almost certainly an unauthorized, cracked release. Using it poses legal, ethical, and serious security risks. While InDesign is powerful software, the safest and most responsible approach is to use a current, licensed version or switch to a legitimate alternative. Adobe InDesign CC 2015 12.5.0 Portable -x86x64- .rar
She never used cracked software again.