Simplify3D

Last few days in Simplify3d v4, I've been getting this error or failed message when ever I open an existing factory file:

Failed to parse XML file
Encountered incorrectly encoded content.
OK

After hitting ok for the amount of Processes previsioly created, the factory files opens up. However some of the save settings are missing or revert back to default values: Primary Layer Height, External Infill Angle Offsets, Layer Modifications, etc.

Has anyone come across this message? Can Simplify3d be corrupt? Possibly reinstall it? If so, is there a way to save the "Select Profiles" I have created for different filament settings for my printer?

One note even though I have a few Select Profiles created, and choose the appropiate one depending if I'm using PLA or PETG, I sometimes tweak the setting to better suite the specific model I'm printing: layers, speed, processes, etc. However I don't update the current modified profile. I don't want to update it in order to keep my initial general good settings for a specific filament. Am I doing something wrong this way to create the error/failed message? Thanks.

I am tring to use simplyfy 3D on my Tronxy x3A with Marlin 1.0.0 but I keep getting a error that refrances CRC mismatch. I made a change to the firmware configuration to remove buffering, but that did not work. Any one have this problem and know how to solve?

Thanks

Attempting connection at .\COM5...
Testing plaintext communication protocol...
Testing binary communication protocol...
READ: start
READ: echo:Marlin1.0.0
READ: echo: Last Updated: May 31 2017 20:08:50 | Author: (none, default config)
READ: Compiled: May 31 2017
READ: echo: Free Memory: 12142 PlannerBufferBytes: 1232
READ: echo:Stored settings retrieved
Testing alternate communication protocols...
READ: echo:SD init fail
READ: ok
WARNING: CRC mismatch detected
READ:
Attempting RTS reset and trying again...
Connection failed.

Is there anyone who tested S3D v4.1.2 with MacOs 11 Big Sur?

https://www.fabbaloo.com/blog/2020/4/8/dont-worry-simplify3d-5-is-on-the-way

So im printing a model from here and scaling it up in size and the parts are fit together types however the torso area how can I know the leg and the torso would fit? If I scale up all the same size its way too huge.. Does S3d have a tool to get a rough draft minus me having to measure my printed part?