Got it from here: Download-Center – SketchUp Pro which was referenced from here: SketchUp Make 2016 : Download Links - #17 by anondude808 since I was looking for the 2016 version since that’s the last version to have a 32-bit version. The 2021 version is only 64-bit and the plugins I need to use does not work on a 64-bit version and it even specifies “ONLY WORKS ON 32-BIT VERSION” or something along those lines. So yeah, that’s why I’m looking at the 2016 version which happens to be the last 32-bit version of SketchUp.
I don’t know why my profile says I am using 2021, must have been when I was trying out the free web version which is probably based on the 2021 version. Or it must have recorded my recent activities on the 2021 whereby I tried installing the plugins but they of course don’t work…