I have an old MAC model Se 30 computer and I am in need for a IOS 7.5 operating system

OK. The first link in my previous reply shows where to find a Network Access Disk 7.5 download. However, you would need another pre-1998 Mac with a built-in floppy drive in order to create a bootable floppy from this. You would also need an appropriate version of StuffIt Expander and a Disk Copy 4.2 utility. Do you have access to such a computer, or do you know someone who does?

If your SE/30 has a working operating system, you could possibly use this machine to create the bootable NAD 7.5 floppy (or even to install a complete System 7.5.3 via 19 floppy-sized parts). Hence my earlier question about which operating system it is running now.

Also, what else do you have to work with? A Disk Tools floppy disk that works on the SE/30? Another old Macintosh computer (exact model)? An old Windows PC with a floppy drive? A more modern Mac or PC with a USB floppy drive? An external SCSI hard drive or CD-ROM drive? A SCSI and/or USB Iomega Zip drive?

Hi,

You mentioned that the computer is working. Does this mean that the SE/30 has another operating system version installed right now? If so, which?

The following discussion could perhaps be of interest to begin with.

Mac SE FDHD Start up - Apple Community

Macintosh SE/30: Technical Specifications - Apple Support

Since System 7.5 has been introduced 30 years ago, I'm afraid that Apple does not offer any downloads anymore.

However, if you type "download system 7.5 apple" into your search engine, you might get some results.

Or search the common internet marketplaces for available, original system 7.5 CDs or Floppy Disks.