I’ve uploaded the file here: https://chpohl.de/gs290/twrp-3.5.0-35-GS290.img.
Please note: It’s just the file I previously downloaded at https://build.lolinet.com/file/twrp/GS290/android-10.0/twrp-3.5.0-35-GS290.img. I didn’t alter the file in any way. I even didn’t compile it myself. So don’t blame me for any problems in case you encounter some with it.
Have fun! 
Kind regards
Christian