You can often find older versions via the Creative Cloud Desktop app under "Other Versions" in the apps tab, provided they are still supported in the Adobe archive.
Ensure you have an active Creative Cloud subscription, as Premiere Pro CC 2019 is not free software. Adobe Premiere Pro CC 2019 v13.1.3
For optimal performance in v13.1, set up a dedicated SSD for your OS and a separate high-speed drive for your media and scratch disks. You can often find older versions via the
A dedicated 4-8GB graphics card (like the GTX 1080 series) is ideal for hardware acceleration. Essential Getting Started Resources Adobe Premiere Pro CC 2019 v13.1.3