Hi Gastón ;
You are most welcome to use my PSR viewer. Its free & open source. The latest version has just been released ... http://chrispollach.blogspot.com/2019/04/psr.html
The above PSR Viewer example is for PB2019 R2 and is built from the latest STD Framework for PB2019 R2 ...
http://chrispollach.blogspot.com/2021/01/2020r2.html
Also, since this is a PB2019 R2 version, the latest PSR Viewer application is also Theme ready. Note that it is also multi-lingual as well.
I also have a version for PB2019 R3 that is PowerClient ready and a "beta" version for the upcoming PB/PS2021's PowerServer edition. So for those who are looking into participating in the "Preview" of PB/PS2021 - please contact me directly to get that version.
Regards ... Chris