Hello
I have a CHR 7.17.2 on Proxmox.
I upgraded from 7.16.1 using the inside updater tool.
What can I do now since I need to downgrade because of the lost dhcp lease issue on 7.17.2 ?
Wich file do I need to load ?
Load Routeros main package of required version on Files, next go to System / packages and hit Downgrade.
PS excuse me but this is an odd question coming from a certified trainer, no? 
It’s even in documentation: https://help.mikrotik.com/docs/spaces/ROS/pages/40992872/Packages
Or is your question: How to get the older package version ?
Get the link of the current version, copy and the paste in your browser but change the version number to the one you need (2 times).
Hello!
Sorry but it is an odd question since I have tried doing as indicated in the docs with no avail.
My specific question is for the CHR, not for RouterOS on Routerboards! I have written clearly in the first question!
CHR ! 
We have a lot of files, different files for chr. I used the IMG when I first installed.
I have tried with img, renamed in npk as suggested in the forum but doesn’t work.
I’m not following.
There is an NPK for CHR (main package).
You can drop it on the current running instance (with the required version using that little trick) and then downgrade ?
Make sure to have backups (binary and export).
Sorry, please point it to me!
I may have overseen it!
All current and historical releases
https://mikrotik.com/download/archive
I think he means this (x86 edition) as its also linked under chr
https://download.mikrotik.com/routeros/7.16.2/routeros-7.16.2.npk
aha, so you suggest to try the plain x86 release? I will release as soon I have possibility to have some downtime.
Thank you, I didnt think to use the x86 on CHR to downgrade.
I knew that, thank you, my issue was to fine the right package for CHR
They aren’t two versions/releases.
On the “current” page the same file is listed/linked twice:
- RouterOs v7 → x86 → Main Package
- Cloud hosted router → Main Package