Adobe does not offer "free" permanent downloads of older Premiere Pro versions; however, you can access them through an active subscription or limited official trials. Official Ways to Access Older Versions
Cybercriminals know that Premiere Pro is popular. They inject Trojans into the Setup.exe files. Once installed, the malware can encrypt your video projects and demand Bitcoin for their release. Security firms like Kaspersky and Malwarebytes flag 70% of "cracked" video editing software as malicious. adobe premiere pro free download old version