@ottakanawa
So, the old link I had up in my step-by-step got updated to a newer client version. It's supposedly against some forum rule to post some kinds of links... blah, blah, blah. So, I can tell you there is a link on 'up to down' regarding the full client installer of Origin 10.5.x.x.x which should enable you to go through the steps I previously listed and get it working. Initially, you get the client installer (be sure it's the 228mb one and not a 24 mb one) and disconnect from internet while you install. While in the process of installing, choose option to NOT allow automatic updating. After it's done, you'll open that 'local.xml' file as described in my previous posts and insert 3 lines of code then save the file. These are the 3 lines;
<Setting value="true" key="MigrationDisabled" type="1"/>
<Setting key="AutoPatchGlobal" value="false" type="1"/>
<Setting key="AutoUpdate" value="false" type="1"/>
After that, you go through your system and delete those 'OriginThinSetupInternal.exe's. Then you can connect internet and launch Origin client. You'll get those prompts to update but, select NO / Cancel / close out of those. Double check the 'local.xml' file to be sure those values remain at 'false' and '1' as well as re-deleting those 'Internal.exe's again. You'll repeat this process till the Origin client stops prompting you to update to the EA client.
Note** You can leave the EA client installed but, you should change it's settings so that it installs games in the same place you have Origin installing games.... the \Origin Games\ folder. That'll just simplify things for future use.