AFAIK you cannot install a new packet without upgrading the entire system. The is ane IgnorePkg flag in /etc/pacman.conf but I don’t know if it’ll be any use here or even if it can be used in your case.
I realise this isn’t what you wanted to hear, so sorry.
(And anyway, why would you not want to update? You should always stay updated.)
In general. Partial Updates are not supported on a rolling release distribution.
So keeping 1 package old is a recipe for disaster at some point.
If an up-to-date Manjaro does not work with your monitor, maybe it’s time to find a new distribution for that machine?
Also, the issue you have, is not “I can’t install a single package”, but rather “System breaks if I update it”.
So maybe you should see if you could get that part fixed instead?
Please understand me. I am not intentionally malignant.
I cannot update my system but I really dont need to.
Switching distributions dont solve update problem and I cannot buy new monitor now.
I asked this question ONLY because I know I can somehow install single packet because I did it twice.
Once by CLI command ( i dont remeber what )
and once by additional packet manager called ‘oprogramowanie’ ( in polish - ‘software’ in english )
which installed only application which I want ( for example game) without updating.
So I know it is possible but I dont know how.
So I ask this question once again.
Download packages which you need from one of mirrors: https://repo.manjaro.org/ and install them. But you should have in mind that packages which you download may need other packages which may need another packages etc etc… Loop of dependencies in some cases may be long. And in some cases those packages may require newer package than available in your system. In some cases this operation will be impossible without full update.