if you are on PC and have the live as well as PTS installed, you will have in the folder "my games" two directories for Snowrunner and SnowrunnerBETA - which contain the mod subscriptions with download files. So if you have subscribed 50 mods and maps, you will download them for each of the sessions. Although both folders are content-wise the same.
I tried and verified, that you can work around that with the "MKLINK /J" command to LINK e.g. the mod directories of SnowrunnerBeta to the corresponding directories in Snowrunner as any mod/map update is the same for BOTH versions. For details: Look at the "mklink" help.
Edit/Update: Your SAVE Files are in My Games\SnowRunnerbeta\base\storage
Go to your snowrunnerbeta and back up the two folders "base" and "media" there. Plainly to be sure.
Your mods for the live and PTS version are in .... My Games\SnowRunnerBeta\base\Mods
Edit for Clarification:
First delete the SnowrunnerBETA\base\mods directory.
in command shell, then use:
MKLINK /J c:....\SnowRunnerBETA\base\Mods\ c:....\SnowRunner\base\Mods
Its always the directory first where the "link" shall be placed (likely your BETA) and thats pointing to the second parameter - the new directory it shall refer to. You will find the directory where the ".modio" subfolder is. Its "hidden".
You link both directories once -> no "double downloads" any more. Totally transparent for the operating system. So any access to snowrunnerbeta-Mods is treated as if you access snowrunner-mods. If you downloaded a mod once, you got it in BOTH mod-directories as one is referencing the other. Works like a charm and reduces download traffic & time
If you have not much space in your profile folder left, you can also "link" the Mygames\Snowrunner with some gigabytes of mods completely to a different location. I did that too, works also perfectly. Move the folder to a new disk and then "mklink /J x:\source y:\destination