MAS2 make a icon:
Drive:\STEAM\steamapps\common\rFactor 2\Support\Tools \MAS2.exe
Mod Manager make a icon:
Drive:\STEAM\steamapps\common\rFactor 2\Bin64\ModMgr.exe
Mod Manager is another handy tool
With this you can view all content, version number and whether they are installed or not.
So if you say downloading from Race Department or checking content you don't have to start Steam or rFactor2.
You can also view other components like custom audio, talent, hud, etc.
I like to disable everything except Vehicle and Locations.
To disable individual component entry click on the little tab eg: Snd = Sound
If I want to view HUDs to check something I click HUD otherwise don't need them in list.
You will notice in my Mod Manager that all the content in under Status it says "In use by 1 mod" "In use by 9 mods" etc.
Way back I got sick of booting up rF2 to get my room online and see I needed to remake room mod, test it, make real road and publish before you could get online.
I quickly worked out any content included in rfmods could not physically be removed when updated. I told everyone on server not to delete the old rfmods till iIsaid so that would automatically keep old versions of content still installed so we could use old rfmods for a day.
To clarify with No rfmods: downloaded files and "installed" folders are deleted.
With rfmods: downloaded files are deleted but installed folders are retained so rfmods still work.
NOTE: all rfmods must be installed all the time or any installed content updated will be deleted and rfmods will not work.
Another handy feature is you can use multiple Packages Dir: ( Directory) to store 3rd party content. This can be a big plus if you have limited SSD space
You can also store official included content out of the steam folder by copying it to a archive then unsubscribing it.
Note you won't get updates anymore instead manually download them when it suits you
Majority of content in rF2 does not get updated too much so not a worry.
1. Make folders in your sim patches archive I call mine PACKAGES CARS, PACKAGES INDY, PACKAGES TRACKS HISTORIC, etc.
2. Copy content from download cache to your new folders, don;t copy the numbered folder just the content.
BEYOND COMPARE free trial will make it easy to find content in folder list.
It can exclude all folders so all you will see is a list of content ( see screenshot)
3. In Mod Manager click on the "B" next to Packages Dir and browse for the folder/s you made
click OK now you can change directory in drop down list and any uninstalled content in that directory will show up. Click on default folder to change it back
This method I have 117GB of content in archive on slow 500kb SSD.