Wonder what the difference is between our Sims and why the aircraft shows normally for you?
I strongly believe that you should be able to run this AC on any version of FSX as the 'base' sim is the same, especially if you have SP 1&2 installed. The intent of SP1 and SP2 was to provide 'fixes' for issues which surfaced after initial release.
The Acceleration pack simply was an add-on to FSX which contained the code from both service packs and added some new scenery, aircraft and multiplayer capabilities - none of which relates to why you have issues with some AC textures in your sim. I have tried AC specifically for Acceleration and they show up OK (look complete), but are not fully functioning - ie. no response with some clickspots in VC, no HUD in jets, non-functioning guns, missiles etc. Needless to say, I didn't keep them around for long. In other words, textures show up 100%, but functionality falls short of 100% if you're downloading mainly military jets into FSX without Acceleration.
Which brings me to my final point - what does your FSX setup look like ? Everyone's sim will be different as over the years everyone will have tried countless 'new' addons, only to be bored with them a few days later and delete them. This sometimes will lead to 'leftovers' left behind to add clutter to the sim, all of which just creates some added confusion when the program tries to load up new textures etc. for a new flight. FSX config file is another issue which comes up over and over again - do you have many 'tweaks' ? I personally found out that more tweaks is not necessarily better. Highmemfix is a must, rest are really not that crucial.
I would try to do a FSX & computer system cleanup/check as the next step :
1) Make a backup copy of the FSX config file and save it to a folder on your desktop (just in case) , delete the one you have inside FSX - next time you run FSX - a new one will be built automatically.
2) Go thru the Effects folder and delete any effects you know relate to any aircraft, boats etc. which you no longer have installed in FSX.
3) Follow Paul Anderson's method outlined in the link (below) to get rid of any leftover textures from addons you no longer have installed -
http://www.sim-outhouse.com/sohforums/showthread.php/76686-re-FSX-cleanup
4) Run your default disk cleanup utility on your operating system.
5) Go to Piriform site, and if you don't have it already, download and run the free CCleaner utility -
https://www.piriform.com/ccleaner/download
6) Run a background check for malware using the free Malwarebytes, or similar program -
https://www.malwarebytes.com/
7) If you have the old fashioned spinning hard drive only (not solid state) - defragment it, and ask it to get rid of 'junk files' as well. I use SmartDefrag Free -
https://www.iobit.com/en/iobitsmartdefrag.php
See if that helps - sometimes it's the strangest things which prevent others from installing and running properly.
Good Luck,
MZ.