First thing to do is to do a clean uninstall. This is to make sure nothing is left behind from when the game uninstalled itself by mistake. Which does happen occasionally and can mess things up.
Use this link on doing that:
https://modthesims.info/wiki.php?title=Game_Help:Uninstall
Then once you've got it fully uninstalled, then install the base game only.
Launch the game to make sure things are working properly.
Patch the base game.
Before you try GrumpyLoader again, try installing the patch while in safe mode. Believe it or not that can help. I had problems installing the Sims 2 base game patch on Windows 7 until I tried going into Safe Mode. Safe Mode brings what loads only to what's necessary. Here's instructions for that: https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode
Not bypassing errors is ideal. But do what you need to do in order to get the game patched.
Then load up your game and make sure things look fine.
Then install your EP's/SP's. Load up each EP as you install them to make sure they and the previous ones are there. Then patch and load again for each thing you install that has a patch.
Then you're going to want to Google Securom and Windows 10 to figure out how to deal with that (I can't go into detail or find a link for you due to a few of the required steps). But Securom and Windows 10 do not get along so you'll want to deal with that so you don't get lag.
Edit to add: Saw Cinebar mention that error might be due to launcher bug. Here's how to bypass the launcher in Windows 10: http://www.modthesims.info/wiki.php?title=Game%20Help:Bypassing%20Launcher
Apartment Life would be Sims2EP8.exe
Mansion & Garden Stuff if you have that is Sims2EP9.exe.
Those are the only 2 .exe's not listed on that site that you would need, I believe. But let us know if you need another one and we can help.
