How modify UBCD to fit on a regular CDRom 700mb

[StIwY]

Hello, i'm a collector of vintage hardware. A lot of time i have to test and fix some old vintage laptop - notebook - desktop pc which most of the time have only a CDRom drive inside.

Unfortunately UBCD takes 800mb of space, and does not fit on regular CDROMs 700mb.

Thanks for your attention.

[Reshape4654]

Version 5.3.9 is too big for a CDR, but 5.3.7 does fit on a CDR. Burning one as we speak. (I don't know if 5.3.8 does...)
Scroll down for versions.
https://www.ultimatebootcd.com/download.html?=mtu4

I'm into vintage tech too and I recently just used this for an old PIII 800mhz and Core Duo. Hit me up if you want to talk about old tech.

[StIwY]

Hello, should be possible to remove the antivirus definitions, which takes a large chunk of space. Do you know where are they put inside the ISO image ?