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To be able run 4.5 on a keypad phone with normal screen I would at least have 1 Mb heap memory to have it to run smooth...
If it is touch screen I will at least double the heap to 2 Mb. But of course, the more Mb the merrier.
To have Mini to run nice on a phone is not only about heap size. The implementation of java on the phone is also to be considered. To be honest, if you buy a newer Nokia or Sony-Ericsson you will be more happy than if you buy a cheap Samsung, LG or noname phone.
Yes, heap memory is the kind of memory that Opera Mini can use on your phone. That kind of information (heap size) is very hard to find... as I wrote before the Nokia page was very good before Microsoft time. Most manufactures spec pages do not show heap memory.
And yes again, there is a difference between 3.2 and 4.5. 3.2 took about 100 kb installed on phone and 4.5 takes about 200. That is what we have to pay to have a modern browser running. 4.5 contains a lot of features that consumes more memory.
A phone with 30 MB internal and 3 MB heap is very suited to run Opera Mini 4.5 but (I have to say but!) it also depends on if it is a touch screen phone or not. And of course the size of the screen is part of it as well. That kind of phone should also be able to run Opera Mini 8 but I prefer Opera Mini 4.5 :).
It isn´t that easy to say if Opera Mini 4.5 / 8.0 will run fine on a certain phone just by looking at memory available. The implementation of java is quite different depending on brand.
Nokia has had a very good page where you can read a lot of information about their phones but now it only contains those that they will support from now on ( http://developer.nokia.com/devices/device-specifications/nokia-asha-230 ) so all old ones are dismissed 
If I remember right I think the 2610 has 512 KB heap memory or even less. The internal memory of 2 or 3 MB can not be used by Opera Mini. It is just for saving files etc. Let´s say that the heap memory is 512 KB, after installation there is not much left for loading pages etc. Does it work better if you restart it after installation of Mini?
It looks to me that you have clicked the "Select Code Signing Certificate" link under headline "Options for Opera Mini 8" instead of the link under "Options for Opera Mini 4.5".
There is an option for downloading unsigned build as well.
On the download page choose "Other download options", on next page scroll down a bit and you will find the text "Options for Opera Mini 4.5", then click the link "Select Code Signing Certificate". And finally you can find four links, "All certs", No cert", "Thawte" and "Verisign".
You can always try to download one of the builds that only have one cert, it might work.
Ehhh found one more funny thing...
The SD disappears but page is at least loaded :D.
Go back to SD UI again and the vanishing SD is back.
This happens 100%...
Sony Z3 Compact, Android version: 4.4.4, Mini version: 7.6.40125, host: n15-10-04, using wifi, country: Sweden
There are some problem with Link...
Tried to log in but login never succeeded so I canceled. Bookmarks were downloaded to phone and in Speed Dial UI I had 21 "empty" SD. Clicked one of those and phone tries to open the page but page load doesn´t succeed. Now I tried to load another page but no luck in that either. Mini is "sort of" responding. I can open Menu and quit. After restart the 21 empty SD are gone again but bookmarks are still there. First try to load a page gives the errormsg "Check your settings" second ones succeeds. Logged in to link again and now it works fine.
Yes, Opera Mini 3 servers will be taken down on December 15. Your situation is not bad. You just need to download Opera Mini 4 by visiting m.opera.com with the inbuilt WAP browser. You will then get a version that is suited for your phone.
You have the newest version so no need to download anything. Usually when a new version is available there will be an upgrade message displayed in Mini.
If you want to have Mini in other language than english please download from m.opera.com where Mini is available in +100 languages.