This isn't really so much as a "question" and more so a "report" in case anyone happens to have the same model laptop out there (Acer Aspire E 15 E5-575G-57D4) and is wondering if you can upgrade it to Windows 11 given the looming October 2025 "upgrade to Win 11 or don't get security updates anymore" deadline that is approaching at the time I type this.
I followed the advice here
https://arstechnica.com/gadgets/2024/10/how-to-upgrade-to-windows-11-whether-your-pc-is-supported-or-not/
specifically the "Upgrading in place on a PC with secure boot and any kind of TPM" section … though in my case I found even after the registry edit what worked for me was downloading the Windows ISO file, letting file explorer mount it (if memory serves I believe simply double clicking on it causes it to be mounted on a virtual CD inside of Windows) and then double clicking on the setup file/command … other methods like say " windows 11 installation assistant" didn't work for me it just kept complaining that my CPU wasn't officially supported far as a Win 11 install .. but going to the setup command inside the Windows 11 ISO let me install Win 11 anyways, I got the "what needs your attention" warning screen and clicked on accept and the in place upgrade of Windows 11 proceeded.. afterwards I was able to download security updates and other Win 11 updates without any problems.
If you're going to do this you should however read this article
https://arstechnica.com/gadgets/2024/10/what-i-learned-from-3-years-of-running-windows-11-on-unsupported-pcs/#:~:text=Using%20it%20feels%20pretty%20normal&text=Depending%20on%20how%20you%20do,proven%20to%20be%20mostly%20unfounded.
While I'm happy to report that my Win 11 upgrade ended up with me having the latest version of Windows 11 I'm going to assume that when Microsoft updates to the next latest version of Win 11 I will NOT be prompted to update to it and that I'll have to manually install Win 11 again per the article above - this is important in order to have the most secure version of Windows for example that (hopefully) will be more "hacker proof" .. at that point I'm guessing you'll probably have to follow the advice given here
https://answers.microsoft.com/en-us/windows/forum/all/how-do-i-upgrade-my-windows-11-version-22h2-to/9e6037ad-b318-4166-93ec-40ca3677b6f6
and obviously of course you'll have to manually keep checking yourself to see when Microsoft releases a new version of Win 11 ..
I'd upgraded my laptop to 16 GB of ram a while ago and Win 11 still continues to function pretty much the same as the Win 10 it shipped with , not noticing much of a speed decrease between that and Win 10 far as system responsiveness and doing day to day stuff. I can't say what your experience would be like if you say had seven different programs up and running all at the same time which I don't bother doing …in theory this laptop can be upgraded to 32 GB according to various sources I've checked with but I haven't pulled the trigger as far as say 2400 speed ram (closest in speed to the native ram speed the laptop supports which is apparently 2133 ram ) which I imagine would be two sticks of ram each 16 GB , 2133 speed … which I've seen as cheap as $20 a stick used (plus say $6 shipping and handling, American) for Crucial RAM 16GB DDR4 2400 MHz CL17 Laptop Memory CT16G4SFD824A
https://www.amazon.com/Crucial-16GB-Laptop-Memory-CT16G4SFD824A/dp/B019FRBHZ0/ref=asc_df_B019FRBHZ0?mcid=97d78063a9663c64ba6641096fa17570&hvocijid=14518674915853992041-B019FRBHZ0-&hvexpln=73&tag=hyprod-20&linkCode=df0&hvadid=721245378154&hvpos=&hvnetw=g&hvrand=14518674915853992041&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9052064&hvtargid=pla-2281435178298&th=1
that's the amazon link I don't think putting an ebay link up will do much good given that the moment the ebay item sells out of stock the link isn't there anymore :) .. I saw it sold and shipped directly by amazon once, otherwise you have 3rd party sellers but at least there's the shipped by amazon part which typically means amazon handles customer service which in turn means returning for a refund should be fairly easy if you buy it and it doesn't work.
I used the crucial memory scanner to get info on the sticks of ram currently in the laptop
https://www.crucial.com/store/systemscanner