Soundflower can't be installed on an iMac with High Sierra.

In my experience most E-bay & Amazon sellers DO NOT setup their machines correctly. We get questions on these forums almost daily from users that have bought from them and are very frustrated. By that I mean that what we see are many resellers do not follow Apple's steps in What to do before you sell, give away, or trade in your Mac which leaves buyers in a bind as they have purchased an unusable device and then many times have to fight to get their money back.

I am very happy your experiences have been the opposite however for most it's not worth that gamble when there are excellent alternatives available.

I am empathetic towards your financial & social situation, however there are alternatives available to you. For example a very high quality iMac that will run Sequoia is about $1,079.00 on Macsales.com (https://eshop.macsales.com/configure-my-mac/imac#screen-size:24-0-inch)

If $1079 it too much to shell out in one purchase, then Apple offers 12 month same as cash financing that many buyers simply are not aware of. That means you can buy an Apple refurbished machine for about $121 per month, ( https://www.apple.com/shop/product/G1313LL/A/Refurbished-24-inch-iMac-Apple-M1-Chip-with-8%E2%80%91Core-CPU-and-8%E2%80%91Core-GPU-Gigabit-Ethernet-Silver?fnode=ac893e0669c79864a9064dc2930d27b9056cc9b03d36a5d86267268498f8ab5c5159ce2b457527bc637da72cb33cb2a1a8ff0c338db9fde0cbb1e4853c07c741fc95441f6a50028c5a16108b19c335d6) Yes, that is more than $1079 total but you are using someone else's money for free for 12 months and perhaps a $121 per month pill is easier to swallow.

While I won't discuss my financial situation or living situation with you, the point I'm attempting to make is please don't feel like you are boxed into living with only a 16 year old Mac. There are alternatives available to you if you are willing and able to spend some time to research.

Best of luck to you.

+1 on MartinR's advice. Also, if you can I'd recommend that you contact the developers of Soundflower, which is not an Apple app. As you are learning, by using such an old machine and version of Mac OS that software developers dropped support for this will become more and more of a problem. At 16+ years old you may be ready for a computer upgrade.

You may want to consider a new or newer Mac, note I did not say iMac which means that a current Mac mini M4 would be an excellent replacement if you spec it out wisely. If new is out of the question, consider one of Apple's refurbished Macs or buy a used one from a VERY reputable reseller such as Macsales.com. Don't buy used from:

• E-Bay
• Marketplace
• Amazon
• Craigslist
• Local PC shop
• Friend, neighbor, relative, acquaintance and of course a stranger

If you want to know why, please ask and we are happy to explain why.

Most people around here are suggesting BlackHole Audio instead of Soundflower. What do you want do use it for? with it?

SoundFlower is still available on GitHub but it hasn't been updated for more than 10 years.

If you want a well-develped audio-routing utility I suggest looking at Rogue Amoeba's Loopback. Legacy versions are still available including for High Sierra.

You are right, I have never been poor however I have family that is. In their case it is due to making poor life decisions and being downright lazy so I find myself having little empathy for them. I have seen others become financially challenged for many reasons including illness, accidents and other types of misfortune. However, I have also learned that as long as you have a good mind and use it, one can also reverse many misfortunes. I obviously don't know you and so I am not judging I'm just saying.

Well I'm done recommending to you and can only wish you the best of luck sir.

This article about Soundflower is from 2023, so therefore there must be a version for High Sierra - have you tried the Internet Archive for an older version compatible with High Sierra?

https://www.ac3filter.net/how-does-soundflower-work/

ETA: I found this page on the Internet Archive:

https://web.archive.org/web/20250000000000*/soundflower

Try the second link which is to Cycling74, the original developers of the software before it went over to Rogue Amoeba.

You might want to try BlackHole by existential audio.