Hello Sanjay,
Yes, you remove the old halcust and replace it with the new halcust before you update the server. After the server is updated, you put the halcust folder back and then rebuild the HAL rules.
If there are issues with certain functions on MyStandard, they will be removed until they've been fixed. Recently for example there was an issue with the Connect function, so that function was temporarily removed from MyStandard until the issue had been resolved. Any issue with MyStandard would be prioritised by us so if we do disable a function we will aim to bring it back as soon as possible.
Kind regards,
Edwin
HansaWorld